Question 3
In the following statements, tick 'T' against those which are true and 'F' against those which are false.
(a) Sound cannot travel in a 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 the vibration is large, the 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)
(a) Sound cannot travel in a vacuum. — True
(b) The number of oscillations per second of a vibrating object is called its time period. — False
Reason — The number of oscillations per second of a vibrating object is called its frequency.
(c) If the amplitude of the vibration is large, the sound is feeble. — False
Reason — If the amplitude of the vibration is large, the sound is loud.
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. — True
(e) The lower the frequency of vibration, the higher is the pitch. — False
Reason — The lower the frequency of vibration, the lower is the pitch.
(f) Unwanted or unpleasant sound is termed as music. — False
Reason — Unwanted or unpleasant sound is termed as noise.
(g) Noise pollution may cause partial hearing impairment. — True