First slide

Travelling wave

Question

The intensity of sound is $1.0 W / m^{2}$ . Find the intensity level in dB.

Moderate

A

140 dB
B

150 dB
C

120 dB
D

180 dB

Solution

$β = 10 \log (\frac{I}{I_{0}}) = 10 \log (\frac{1}{10^{- 12}}) = 10 \log (10^{12}) = 10 \times 12 = 120 d B$

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