textbook exercises

Name the physical quantity whose SI unit is hertz. Define

What is meant by supersonic speed?

How does the sound produced by a vibrating object in a medium reach your ears? 

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

List the applications of sound.

Explain how does SONAR work?

The frequency from a source of sound is $600 \mathrm{Hz}$. Calculate the number of times it vibrates in a minute.

A stone is dropped from the top of a tower $750 \mathrm{m}$ into a pond of water at the base of the tower. Calculate the number of seconds for the flash to be heard? $($Given $g=10 \mathrm{m} {\mathrm{s}}^{-2}$ and speed of sound$=340 \mathrm{m} {\mathrm{s}}^{-1}$$)$