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  • In the following statements, tick 'T' against those which are true and 'F' against those which are false. (a) Sound cannot travel in vacuum. (T/F)         (b) The number of oscillations per second of a vibrating object is called its time period. (T/F)

Q3. In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false.

(a) Sound cannot travel in vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)

Answers (1)

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(a) T.

Sound cannot travel in a vacuum as it requires a medium to travel.

(b) F.

The number of oscillations per second of a vibrating object is called its frequency. Time period is the time taken to complete one oscillation.

(c) F.

The sound of a vibration is directly proportional to the square of the amplitude of vibration, therefore, the sound will be feeble if the amplitude of vibration is low.

(d) T.

For humans, the audible range of frequency is 20 Hz to 20,000 Hz.

(e) F.

The pitch of a sound is directly proportional to its frequency.

(f) F.

Unwanted or unpleasant sound is termed as noise.

(g) T.

Exposure to loud noise for a long period of time may cause partial hearing impairment.

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