Updated By SaraNextGen
On January 25, 2024, 11:35 AM

Page No 163: - Chapter 12 Sound class 9 ncert solutions Science - SaraNextGen [2024]

Question 1:

Explain how sound is produced by your school bell.


When the school bell vibrates, it forces the adjacent particles in air to vibrate. This disturbance gives rise to a wave and when the bell moves forward, it pushes the air in front of it. This creates a region of high pressures known as compression. When the bell moves backwards, it creates a region of low pressure know as rarefaction. As the bell continues to move forward and backward, it produces a series of compressions and rarefactions. This makes the sound of a bell propagate through air.



Question 2:

Why are sound waves called mechanical waves?


Sound waves force the medium particles to vibrate. Hence, these waves are known as mechanical waves. Sound waves propagate through a medium because of the interaction of the particles present in that medium.



Question 3:

Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?


Sound needs a medium to propagate. Since the moon is devoid of any atmosphere, you cannot hear any sound on the moon.

Also Read : Page-No-166:-Chapter-12-Sound-class-9-ncert-solutions-Science