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15 May, 14:56

What is the intensity level of a sound with an intensity of 0.000127 W/m2?

65 dB

72 dB

81 dB

120 dB

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Answers (1)
  1. 15 May, 15:05
    0
    DB = 10 log (I/Io)

    Where, Io is the reference intensity which is the minimum intensity that human can hear.

    That is; Io = 10^-12

    Therefore;

    dB = 10 log (0.000127/10^-12) = 80.79

    = 81 dB

    Therefore; the correct answer is 81 dB
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