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5Dec19 SS Q25

0. Consider the following statements regarding noise pollution :
(A) Noise levels decrease as we move away from the source of noise
(B) Materials with high surface/mass density act as good noise barriers
(C) Sound pressure of 2 Pa corresponds to a noise of zero decibel
Choose the correct option from those given below:

  • Option : A
  • Explanation :
    The power of the source remains unaffected but, as the distance increases the intensity of noise from the source decreases and is inversely proportional to square of the distance from the source. Hence statement (A) is correct. Since sound pleasure of 2 pa correspond to sound level of 100 decibel. So statement C is wrong.
    Therefore option (A) is correct.
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