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Question

The intensity of ordinary conversation is rated as nearly
  1. 10 decibel
  2. 50 decibel
  3. 40 decibel
  4. 60 decibel

A
50 decibel
B
40 decibel
C
10 decibel
D
60 decibel
Solution
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Human ear can hear sound from 0dB to 140dB. Intensity of ordinary conversation is rated as nearly 60dB.

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