# NCERT Solutions For Class 8 Science Chapter 13- Sound

## NCERT Solutions for Class 8 Science Chapter 13 – Sound

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:

• Q. When we speak, does any part of our body vibrate?
• Ans. In our body when the lungs force air through the slit, the vocal cords vibrate, producing sound. Muscles attached to the vocal cords can make the cords tight or loose. When the vocal cords are tight and thin,

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.

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?

## NCERT Solutions For Class 8 Science- Chapter-wise

 Chapter -1 Crop Production And Management Chapter -2 Microorganisms: Friends and Foe Chapter-3 Synthetic Fibres and Plastics Chapter-4 Materials: Metals and Non-Metals Chapter-5 Coal and Petroleum Chapter-6 Combustion and Flame Chapter-7 Conservation of Plants and Animals Chapter-8 Cell: Structure and Function Chapter-9 Reproduction in Animals Chapter-10 Reaching the age of adolescence Chapter-11 Force and Pressure Chapter-12 Friction Chapter-14 Chemical Effects of Electric Current Chapter-15 Some Natural Phenomena Chapter-16 Light Chapter-17 Stars and The Solar System Chapter- 18 Pollution of Air and Water