Pankaj Bhatt Solutions for Chapter: Sound, Exercise 4: QUESTIONS

The stem of the tuning fork is pressed against a tabletop. Answer the following questions:

(i) Would the above action produce any audible sound?

(ii) Does the above action cause the table to set into vibrations?

(iii) If the answer is yes, what type of vibrations are they?

(iv) Under what conditions do the above action lead to resonance?

A stretched wire $0.5 \mathrm{m}$ long is made to vibrate in two different modes as shown in the figure. If the wavelength of the wave produced in mode $A$is $1 \mathrm{m}$, 

(i) What is the wavelength of the wave in mode $B$?

(ii) In which case is the note produced louder? Give a reason for your answer.

(iii) In which case the pitch of the note produced is higher? Give the reason for your answer.

The figures given below show the two positions of resonance of a resonance tube. Sketch the vibration of the sound wave in each position. The depth of water level in the first position is 15 cm. What would be the depth of the second length of resonance?

The figure given below shows the waveforms of sound produced by a boy and a girl. Identify these waveforms.

Identify a pure note and a musical note among the following diagrams.

Can two waves of the same amplitude and frequency differ in quality? Explain with diagrams.

The intensity of a sound wave increases from $25 \mathrm{W}/{\mathrm{m}}^2$  to $625 \mathrm{W}/{\mathrm{m}}^2$. How many times does the loudness of the wave increase?

The figures are given below show two waves of some amplitude and frequency. Explain how these waves are different from each other?