NCERT Solutions for Class 8 Science Chapter 13 Sound: In your day to day life, you hear a variety of sounds. Have you ever thought that how sounds are produced? Why we can hear sounds even being far away from the source of the sound? Why the intensity of hearing a sound keeps on decreasing as we move away from the source of the sound? What makes male and female voices so different from each other? You will get the answers to these questions in NCERT Solutions for Class 8 Science Chapter 13 Sound. Sound has a very important role in our lives as through sound we communicate with each other.
You must have observed that when we take a steel bucket and hit it with a small hammer, vibrations are caused. These vibrations are responsible for the production of sound.
Here is the Paheli's question:
In NCERT Solutions for Class 8 Science Chapter 13 Sound, you will learn with the help of a number of examples, how vibration causes the sounds to be produced.
Production of sound in humans is mainly due to the presence of a voice box or larynx. It is found to be present at the upper end of the windpipe. You will understand the structure of the voice box and mechanism of production of sound by voice box after studying NCERT Class 8 Science Chapter 13 Sound. As you go through this chapter, you will get to know the following points
Sound requires a medium to travel. This medium can be a gas, liquid or solid.
Hearing is a process in which eardrum senses vibration and send signals to the brain.
The amplitude, frequency and time period of vibration decides the pitch of the sound. Larger the amplitude, the louder will be the sound.
Some sounds are pleasant as that of a musical instrument and some are unpleasant as that coming from horns, some home appliances and factories, etc.
The range of audible frequency for humans is 20 to 20000 Hz.
Noise pollution is caused due to excessive unpleasant sounds. This can cause various health problems
All the above points that are given here, can be very well understood after doing NCERT solution for class 8 science chapter 13 Sound. There are various topics and subtopics in class 8 chapter 13. These topics are given below:
13.1. Sound is Produced by a Vibrating Body
13.2. Sound Produced by Humans
13.3. Sound Needs a Medium for Propagation
13.4. We Hear Sound through Our Ears
13.5. Amplitude, Time Period and Frequency of a Vibration
13.6. Audible and Inaudible Sounds
13.7. Noise Pollution
After studying the chapter attempt NCERT exercise of science chapter 13.
For better preparation take help of NCERT solutions for class 8 Science Chapter 13 Sound.
Find the answer:
1. What is the speed of sound in air? Compare it with speed of light in water?
2. List out various factors that course noice pollution?
Q13. Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?
Q11. Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.
Q12. Sketch larynx and explain its function in your own words.