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)
(a) True Sound calls for a medium to journey via. Since vacuum is without any medium, sound can't journey thru it. (b) FalseThe wide variety of oscillations according to 2nd of a vibrating item is called its frequency.Time length is the time required to complete one oscillation. (c) False Loudness of a valid is proportional to the rectangular of the amplitude of its vibration. When the amplitude of vibration of a valid is large, the sound could be very loud. The sound is feeble for small amplitude. (d) True Humans can't pay attention sounds of all frequencies. Humans can listen a valid whose frequency falls withinside the variety of 20 Hz-20,000 Hz. The sound having frequency out of this variety is inaudible to humans. (e) False The pitch of a valid is proportional to its frequency. As the frequency of vibration increases, the pitch of the sound additionally increases and vice-versa. A sound is stated to be excessive pitched if its frequency of vibration is excessive, and is low pitched for a small frequency of vibration. (f) False Unwanted or ugly sounds are called noise. Sounds which might be melodious and beautiful to ear are referred to as music. (g) True Unwanted or unsightly sounds are called noise. If one is subjected to loud unsightly sound constantly for an extended time, then it is able to reason brief listening to impairment.
