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18 May, 11:36

A construction explosion has an intensity I of 1.25 x 10-4 W/m2. Find the loudness of the sound in decibels if W/m2. Round to the nearest tenth.

A. 81 decibels

B. 161 decibels

C. 82.2 decibels

D. 12.5 decibels

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Answers (1)
  1. 18 May, 11:46
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    We solve this problem by using the decibels formula which is expressed as:

    dB = 10 x log (Isig/Iref)

    where dB is decibels, Isig is the intensity of the signal and Iref is the intentsity of the softest sound the human ear can hear which has a value of 10^-12.

    We solve as follows:

    dB = 10 x log (1.25 x 10-4 / 10^-12) = 80.97 decibels

    Therefore, the correct answer is option A, 81 decibels.
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