H C Verma Solutions for Chapter: Sound Waves, Exercise 1: QUESTIONS FOR SHORT ANSWER

If you are walking on the moon, can you hear the sound of stones cracking behind you? Can you hear the sound of your footsteps?

Can you hear your own words if you are standing in a perfect vacuum? Can you hear your friend in the same conditions?

A vertical rod is hit at one end. What kind of wave propagates in the rod, if

(a) the hit is made vertically?

(b) the hit is made horizontally?

Two loudspeakers are arranged to face each other at some distance. Will a person standing behind one of the loudspeakers, clearly hear the sound of the other loudspeaker or the clarity will be seriously damaged because of the collision of the two sounds in between?

The voice of a person who has inhaled helium has a remarkably high pitch. Explain based on the resonant vibration of the vocal cord filled with air and helium, respectively.

Draw a diagram to show the standing pressure wave and standing displacement wave for the $3^{\mathrm{rd}}$ overtone mode of vibration of an open organ pipe.

Two tuning forks vibrate with the same amplitude, but the frequency of the first is double the frequency of the second. Which fork produces more intense sound in the air?

In discussing the Doppler effect, we use the word "apparent frequency". Does it mean that the frequency of the sound is still that of the source, and it is some physiological phenomenon in the listener's ear that gives rise to the Doppler effect? Think for the observer approaching the source and for the source, approaching the observer.