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

(a) Sound cannot travel in vacuum.[[1]]

(b) The number of oscillations per second of a vibrating object is called its time period. [[2]]

(c) If the amplitude of vibration is large, sound is feeble. [[3]]

(d) For human ears, the audible range is 20 Hz to 20,000 Hz. [[4]]

(e) The lower the frequency of vibration, the higher is the pitch.[[5]]

(f) Unwanted or unpleasant sound is termed as music. [[6]]

(g) Noise pollution may cause partial hearing impairment. [[7]]