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NCERT Solutions for Class 11 Physics Chapter 15 Waves hold significant importance for both Class 11 board exams and competitive exams like NEET and JEE Mains. These NCERT solutions waves class 11 are invaluable aids in understanding and mastering the concepts presented in the chapter, encompassing questions from 15.1 to 15.27, with questions 15.22 to 15.27 included in the additional exercise section. Prepared by subject experts, these NCERT solutions provide comprehensive support for students. The PDF format of class 11 physics waves ncert solutions by Careers360 facilitates a deeper understanding of the diverse applications of waves in different mediums, making it a valuable resource for students.
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The Waves Class 11 chapter 15 solutions discuss questions based on mechanical waves. Electromagnetic waves (discussed in class 12 NCERT) do not necessarily require a medium, that is they can travel through a vacuum. Light, radio waves, X-rays, are examples of electromagnetic waves and they travel in a vacuum at a speed equal to the speed of light. The third kind of wave is Matter waves. They are associated with constituents of matter: electrons, protons, neutrons etc. For example molecules matter waves associated with electrons are employed in electron microscopes. NCERT solutions for Class 11 Physics Chapter 15 Waves help in understanding the formulas studied in the chapter. The class 11 physics ch 15 ncert solutions will help you to understand the concepts studied in the NCERT textbook.
** This chapter has been renumbered as Chapter 14 in accordance with the CBSE Syllabus 2023–24.
Free download class 11 physics waves NCERT solutions PDF for CBSE exam.
NCERT Syllabus For Class 11 Physics Chapter 15 Waves: Exercise Question And Solutions
Answer:
Mass per unit length of the string is
The velocity of the transverse wave in the string will be
Time taken by the disturbance to travel from one end to the other is
Answer:
Time taken by the stone to the pond can be calculated using the second equation of motion
s = 300 m
u = 0
a = 9.8 m s -2
Time taken by the wave to propagate from the pond to the top of the tower is
t 1 + t 2 = 8.7 s
The splash is heard at the top of the tower after a time of 8.7 seconds.
Answer:
Mass per unit length od the wire is
The speed of a transverse wave in a wire is given by
The tension in the wire should be such that the speed of the transverse wave in it is equal to 343 m s -1 .
Q.15.4 (a) Use the formula to explain why the speed of sound in air is independent of pressure
Answer:
Where are the Bulk's modulus and the density respectively
As we know
where M is molecular weight of air and V is the volume of 1 mole of air
From the ideal gas equation PV=nRT
since we are talking about 1 mole we take n = 1
PV=RT
The expression for the speed of sound becomes
, M and R are constant therefore at constant Temperature the speed of sound in the air do not change and it is clear that speed is independent of velocity.
Q.15.4 (b) Use the formula to explain why the speed of sound in air increases with temperature.
Answer:
From the equation it is clear that the speed of sound is linearly proportional to the square root of the temperature and therefore it will increase with the increase in temperature.
Q.15.4 (c) Use the formula to explain why the speed of sound in air
Answer:
As the humidity of air increases, the proportion of water molecules(M=18) increases and that of Oxygen(M=32) and Nitrogen(M=28) decreases thus reducing the density of air and as the speed of sound is inversely proportional to the square root of density of air, the speed will increase as the density increases and thus it increases with an increase in humidity.
Answer:
No, the given function cannot represent a wave as x or t approach infinity the function won't be converging to a constant value and therefore the converse is not true.
Answer:
No, the given function cannot represent a travelling wave because as x and t become zero the given function won't be converging to a constant value and therefore the converse is not true.
Answer:
No, the given function cannot represent a travelling wave because as x and t become zero the given function won't be converging to a constant value and therefore the converse is not true.
Answer:
(a) The wavelength of the reflected sound wave which will be travelling in air is
(b) The frequency of the transmitted sound wave would not change.
The wavelength of the transmitted sound wave which will be travelling in water is
Answer:
The wavelength of the sound in the tissue is
Q.15.8 (a) A transverse harmonic wave on a string is described by
where x and y are in cm and t in s. The positive direction of x is from left to right.
(a) Is this a travelling wave or a stationary wave? If it is travelling, what are the speed and direction of its propagation?
Answer:
The wave is travelling.
The wave is travelling in the negative x-direction i.e. from right to left.
Speed of the wave is
Q.15.8 (b) A transverse harmonic wave on a string is described by
where x and y are in cm and t in s. The positive direction of x is from left to right.
(b) What are its amplitude and frequency?
Answer:
Amplitude A is 3.0 cm.
Frequency is
Q.15.8 (c) A transverse harmonic wave on a string is described by
where x and y are in cm and t in s. The positive direction of x is from left to right.
(c) What is the initial phase at the origin?
Answer:
The initial phase of the wave at the origin (at x = 0 and t = 0) is
Q.15.8 (d) A transverse harmonic wave on a string is described by
where x and y are in cm and t in s. The positive direction of x is from left to right.
(d) What is the least distance between two successive crests in the w ave?
Answer:
The difference between two consecutive crests is equal to the wavelength of the wave.
Answer:
for x = 0
The time period of oscillation is T
To make the y versus t graph we tabulate values of y(t) at different values of t as follows
The graph of y versus t is as follows
For other values of x, we will get a similar graph. Its time period and amplitude would remain the same, it just will be shifted by different amounts for different values of x.
Q.15.10 (a) For the travelling harmonic wave
where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of
Answer:
The phase difference between two points separated by a distance of is given by
Phase difference for two points separated by a distance of 4 m would be
Q.15.10 (b) For the travelling harmonic wave
where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of
Answer:
The phase difference between two points separated by a distance of is given by
Phase difference for two points separated by a distance of 0.5 m would be
Q.15.10 (c) For the travelling harmonic wave
where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of
Answer:
The phase difference between two points separated by a distance of is given by
Phase difference for two points separated by a distance of would be
Q.15.10 (d) For the travelling harmonic wave
where x and y are in cm and t in s. Calculate the phase difference between oscillatory motion of two points separated by a distance of
Answer:
The phase difference between two points separated by a distance of is given by
Phase difference for two points separated by a distance of would be
Q.15.11 The transverse displacement of a string (clamped at its both ends) is given by
where x and y are in m and t in s. The length of the string is 1.5 m and its mass is .
Answer the following :
(a) Does the function represent a travelling wave or a stationary wave?
Answer:
The given function is of the following form
which is the general equation representing a stationary wave and therefore the given function represents a stationary wave.
Q.15.11 (b) The transverse displacement of a string (clamped at its both ends) is given by
where x and y are in m and t in s. The length of the string is 1.5 m and its mass is .
Answer the following :
(b) Interpret the wave as a superposition of two waves travelling in opposite directions. What is the wavelength, frequency, and speed of each wave?
Answer:
We know that when two waves of the same amplitude, frequency and wavelength travelling in opposite directions get superimposed we get a stationary wave.
Comparing the given function with the above equations we get
Q.15.11 (c) The transverse displacement of a string (clamped at its both ends) is given by
where x and y are in m and t in s. The length of the string is 1.5 m and its mass is .
Answer the following :
(c) Determine the tension in the string
Answer:
The mass per unit length of the string is
Speed of a transverse wave is given by
Answer:
(i) (a) All the points vibrate with the same frequency of 60 Hz.
(b) They all have the same phase as it depends upon time.
(c) At different points, the amplitude is different and is equal to A(x) given by
(ii)
Answer:
(a) It represents a stationary wave.
(b) The given function does not represent a wave as we can see at certain values of x and t the function would not be defined.
(c) It represents a travelling wave.
(d) It represents a stationary wave. It is a superposition of two stationary waves which ultimately results in another stationary wave.
Q.15.14 A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of . The mass of the wire is and its linear mass density is . What is (a) the speed of a transverse wave on the string?
Answer:
Length of the string is l given by
Since the wire is vibrating in the fundamental mode
Speed of the string (v) is
Answer:
Tension in the string is given by
Q.15.15 A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency ) when the tube length is or . Estimate the speed of sound in air at the temperature of the experiment. The edge effects may be neglected.
Answer:
The pipe behaves as a pipe open at one end and closed at one end. Such a pipe would produce odd harmonics i.e.
Two consecutive modes of vibration are given in the question
For l 1 = 25.5 cm
For l 2 = 79.3 cm
Since at both these modes the system resonates with the same frequency we have
(our approximation is correct since the edge effects may be neglected)
Q.15.16 A steel rod long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod are given to be . What is the speed of sound in steel?
Answer:
When the rod is clamped at the middle at is vibrating in the fundamental mode, a node is formed at the middle of the rod and antinodes at the end. i.e.
where L is the length of the rod.
Speed of sound in steel is
Answer:
Let the n th harmonic mode of the pipe get resonantly excited by a 430 Hz source.
The pipe resonates with a 430 Hz source in the fundamental mode when one end is open.
Let the m th harmonic mode of the pipe get resonantly excited by a 430 Hz source when both ends are open.
Since m is coming out to be less than 1 the same source will not be in resonance with the pipe if both ends are open.
Answer:
Since frequency increases with an increase in Tension, the frequency of string A must have decreased. Therefore .(If it were 330 Hz the beat frequency would have increased with decrease in Tension in string A)
Q.15.19 Explain why (or how) :
(a) in a sound wave, a displacement node is a pressure antinode and vice versa,
Answer:
In the propagation of a sound wave the pressure increases at points where displacement decreases, Therefore maximum pressure at points of minimum displace and vice-versa i.e. a displacement node is a pressure antinode and vice versa.
Q.15.19 Explain why (or how) :
(b) bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”,
Answer:
Bats emit ultrasonic waves and when these waves strike the obstacles and get reflected back to the bats they ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”.
Q.15.19 Explain why (or how) :
Answer:
We can distinguish between the two notes with the same frequency as the harmonics they emit are different.
Q.15.19 (d) Explain why (or how) :
Answer:
Transverse waves produce shear, gases don't have shear modulus and cannot sustain shear and therefore can only propagate longitudinal waves. Solids have both shear and bulk modulus of elasticity and can propagate both transverse and longitudinal waves.
Q.15.19 (e) Explain why (or how): the shape of a pulse gets distorted during propagation in a dispersive medium.
Answer:
As we know a pulse contains waves of different wavelengths, these waves travel at different speeds in a dispersive medium and thus the shape of the pulse gets distorted.
Answer:
where is the frequency as observed by the observer, is the frequency of the source, v is the speed of the wave, v o is the speed of the observer and v s is the speed of the source.
(i) (a) When the source is moving towards the observer and the observer is stationary.
(b)
(ii) The speed of the sound does not change as it is independent of the speed of observer and source and remains equal to 340 ms -1 .
Answer:
Speed of the wind v w = 10 m s -1
Speed of sound in still air v a = 340 m s -1
Effective speed with which the wave reaches the observer = v = v w + v a = 10 + 340= 350 m s -1
There is no relative motion between the observer and the source and therefore the frequency heard by the observer would not change.
The wavelength of the sound as heard by the observer is
The above situation is not identical to the case when the air is still and the observer runs towards the yard as then there will be relative motion between the observer and the source and the frequency observed by the observer would change.
The frequency as heard by the observer is
Q.15.22 (a) A travelling harmonic wave on a string is described by
(a) what are the displacement and velocity of oscillation of a point at , and ? Is this velocity equal to the velocity of wave propagation?
Answer:
The displacement of oscillation of a point at x = 1 cm and t = 1 s is
The general expression for the velocity of oscillation is
k=0.005 cm -1
The velocity of propagation of the wave is
The velocity of oscillation of point at x = 1 cm and t = 1 cm is not equal to the propagation of the wave.
Q.15.22 A travelling harmonic wave on a string is described by
(b) Locate the points of the string which have the same transverse displacements and velocity as the point at 5 s and 11 s.
Answer:
The wavelength of the given wave is
The points with the same displacements and velocity at the same instant of time are separated by distances .
The points of the string which have the same transverse displacements and velocity as the point at 5 s and 11 s would be at a distance of
from x = 1cm.
Therefore all points at distances from the point x=1cm would have the same transverse displacements and velocity as the point at 5 s and 11 s.
Answer:
(a) The pulse does not have a definite frequency or wavelength however the wave has definite speed given the medium is non-dispersive.
(b) The frequency of the note produced by the whistle is not 0.05 Hz. It only implies the frequency of repetition of the pip of the whistle is 0.05 Hz,
Answer:
A=0.05 m
Tension in the string is T=mg
The speed of the wave in the string is v
Angular frequency of the wave is
Since at t=0, the left end (fork end) of the string x=0 has zero transverse displacements (y=0) and is moving along the positive y-direction, the initial phase is zero.
Taking the left to the right direction as positive we have
Here t is in seconds and x and y are in metres.
Answer:
Frequency of SONAR =40 kHz
Speed of enemy submarine v o =360 km h -1 = 100 m s -1
This is the frequency which would be observed and reflected by the enemy submarine but won't appear the same to the SONAR(source) as again there is relative motion between the source(enemy submarine) and the observer(SONAR)
The frequency which would be received by the SONAR is
Answer:
Let us assume the earthquake occurs at a distance s.
The origin of the earthquake is at a distance of 1960 km.
Answer:
Apparent frequency striking the wall and getting reflected is
The frequency emitted by the bats is
Speed of sound is v
Speed of bat is 0.03v
Frequency of sound as heard by the bat
The ncert solutions waves class 11 pdf includes in-depth explanations of all the crucial topics and subtopics, making it easier for students to comprehend the concepts.
The NCERT solutions for Waves Physics class 11 are crucial in establishing the groundwork for the Class 12 CBSE board exams, which determine students' admission to higher education institutes. Emphasis on the fundamental concepts and theoretical aspects of this chapter is critical for building a strong foundation for the Class 12 CBSE board exam. Moreover, Class 11 Physics Ch 15 NCERT solutions have been developed in accordance with the latest CBSE and NCERT guidelines and syllabus.
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | Waves |
Wave velocity(W) = Frequency(f) * wavelength (λ) [SI unit- m/s]
where:
v = Velocity of the wave (in meters per second, m/s), T = Tension in the string (in Newtons, N) and μ = Linear mass density of the string (in kilograms per meter, kg/m)
Where:
E = Young's modulus of the material (in Pascals, Pa), ρ = Density of the material (in kilograms per cubic meter, kg/m³)
Comprehensive Coverage: These class 11 physics ch 15 ncert solutions cover all the important topics and questions presented in the chapter, ensuring a thorough understanding of wave phenomena.
Exercise and Additional Exercise Solutions: Detailed solutions are provided for exercise questions (15.1 to 15.21) and additional exercise questions (15.22 to 15.27), allowing for comprehensive practice and self-assessment.
Clarity and Simplicity: The solutions are explained in clear and simple language, making complex wave concepts more accessible to students.
Problem-Solving Skills: By practising with these solutions and class 11 physics chapter 15 waves notes, students develop strong problem-solving skills, which are essential in physics and other subjects.
Exam Preparation: These wave class 11 solutions are designed to help students prepare effectively for their exams, including board exams and competitive exams like NEET and JEE Mains.
Waves is one of the important chapters of Class 11 NCERT syllabus. The questions given in the NCERT books are important to understand the concepts well. There are two exercise and 27 questions discussed in the Waves Class 11 NCERT chapter. For more questions refer to NCERT exemplar.
The main topics covered in the NCERT Class 11 textbook chapter 15 are
Some characteristics of a wave include
Amplitude: The maximum displacement of a wave from its equilibrium position.
Wavelength: The distance between two consecutive points on a wave that are in phase.
Frequency: The number of complete waves passing a point in one second.
Period: The time taken for one complete wave to pass a given point.
Speed: The rate at which the wave is travelling through the medium.
Phase: The position of a point on a wave relative to a fixed point in time.
Direction of propagation: The direction in which the wave is travelling.
In transverse wave motion, the particles of the medium move perpendicular to the direction in which the wave travels, creating crests and troughs. Examples include light waves, electromagnetic waves, and water waves on the surface of a liquid.
Yes, the "Waves" chapter in Class 11 Physics is generally considered to be relatively easier compared to some other chapters in the subject. It introduces fundamental concepts like frequency, wavelength, amplitude, and period, and these concepts are typically straightforward to understand.
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Career as a video game designer is filled with excitement as well as responsibilities. A video game designer is someone who is involved in the process of creating a game from day one. He or she is responsible for fulfilling duties like designing the character of the game, the several levels involved, plot, art and similar other elements. Individuals who opt for a career as a video game designer may also write the codes for the game using different programming languages.
Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.
Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.
The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.
A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.
An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.
They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.
A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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