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a. travelling longitudinal wave.

b. travelling transverse wave.

c. stationary longitudinal wave.

d. travelling transverse wave.

4. In sound propagation, particles of the medium

a. also travel in the direction of sound.

b. move about their mean positions.

c. remain still.

d. also travel in a direction opposite to that of sound.

5. In the propagation of longitudinal waves, the motion of the individual particles of
medium is

a. perpendicular to the direction of propagation of the wave.

b. in the same direction as that of the propagation of the wave.

c. in random directions.

d. in anticlockwise directions.

SUBJECTIVE

1. How does the sound produced by a vibrating object in a medium reach your ear?

2. Explain how sound is produced by your school bell.

3. Why sound waves are called mechanical waves?

4. Suppose you and your friend are on the moon. Will you be able to hear any sound

produced by your friend?

5. When the wire of a guitar is plucked, what types of waves are produced in (i) air

and (ii) wire? Give reasons in support of your answer.

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