EASY
9th Foundation
IMPORTANT
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The diagram represents two different sound waves.

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Important Questions on Sound

EASY
9th Foundation
IMPORTANT

The diagram shows the position of the air particles due to propagation of sound, represented by straight lines, at a particular instant from P to Q.

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Which of the following statements correctly depicts the pressure variation with respect to distance?

MEDIUM
9th Foundation
IMPORTANT
There are two walls A and B which are 180 m apart from each other. A boy standing at 60 m away from wall A claps his hands once. If the speed of sound in air is 330 ms-1, what is the time interval between the first and the second echo that he hears?
EASY
9th Foundation
IMPORTANT

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.

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

EASY
9th Foundation
IMPORTANT

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

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MEDIUM
9th Foundation
IMPORTANT
Which of the following statements is correct, when two sound waves with same frequency and constant phase difference interfere?
EASY
9th Foundation
IMPORTANT

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.

EASY
9th Foundation
IMPORTANT

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 :

MEDIUM
9th Foundation
IMPORTANT
A man standing in front of a large wall claps at a regular frequency of 10 Hz. He finds that the echoes coincide with his clapping. (The speed of sound in air is 330 m s-1).
(i) Time taken between successive clapping is 0.1 s
(ii) The distance between the man and the wall, after he stops clapping, if he hears one more echo is 33 m.
(iii) The distance between the man and the wall, after he stops clapping, if he hears four or more echoes is 66 m.