Anil Ahlawat Solutions for Chapter: Sound, Exercise 1: EXERCISES

There are two walls $A$ and $B$ which are $180 \mathrm{m}$ apart from each other. A boy standing at $60 \mathrm{m}$ away from wall $A$ claps his hands once. If the speed of sound in air is $330 {\mathrm{ms}}^{-1}$, what is the time interval between the first and the second echo that he hears?

A microphone is connected to a cathode ray oscilloscope. A loudspeaker giving a single note is switch on. The trace shown in the figure appears on the screen.

Which of the following shows the softer but same frequency note of the given note?

Four sound waves $M, N, O$ and $P$ are shown in figures below. Which of the following is correct statement?

Which of the following statements is correct, when two sound waves with same frequency and constant phase difference interfere?

Read the passage carefully and answer the following questions.

Two tuning forks, $A$ and $B$ vibrate with frequencies in the ratio $2:7$ and their wavelengths in the ratio $3:4$ respectively. Both the tuning forks are placed in different media.

Find the tuning fork producing greater velocity of sound.

Read the passage carefully and answer the following questions.

Two tuning forks, $A$ and $B$ vibrate with frequencies in the ratio $2:7$ and their wavelengths in the ratio $3:4$ respectively. Both the tuning forks are placed in different media.

The tuning fork $A$ produces relatively :

A man standing in front of a large wall claps at a regular frequency of $10 \mathrm{Hz}$. He finds that the echoes coincide with his clapping. (The speed of sound in air is $330 \mathrm{m} {\mathrm{s}}^{-1}$).
(i) Time taken between successive clapping is $0.1 \mathrm{s}$
(ii) The distance between the man and the wall, after he stops clapping, if he hears one more echo is $33 \mathrm{m}$.
(iii) The distance between the man and the wall, after he stops clapping, if he hears four or more echoes is $66 \mathrm{m}$.

A stone is dropped from the top of a tower of $125 \mathrm{m}$ high into a pond which is at base of the tower. When will the splash be heard at the top? (Given $g=10 \mathrm{m} {\mathrm{s}}^{-2}$ and speed of sound$=340 \mathrm{m} {\mathrm{s}}^{-1}$.)