22. Intext questions III

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

 

YesNo, sound waves are mechanical waves and hence need a mediumdon't need a medium to propagate. Due to the absence of atmosphere on the moon and since sound cannot travel can travel in vacuum, we can hearcannot hear any sound on the moon.

 

2. Why are sound waves called mechanical waves?

 

When sound waves propagate through a medium it causes the adjacent particles to vibrateadjacent particles to moveadjacent particles to separate. Sound waves propagate due to movement of particlesinteraction of particlesseparation of particles in the medium due to a series of rarefactionscompressionscompressions and rarefactions. Hence, these waves are called mechanical waves.