First slide

Intensity of

Question

For a sound source of intensity $I W / m^{2}$ , corresponding sound level is Bo decibel. If the intensity is increased to 4I, new sound level becomes:

Moderate

A

$2 B_{0} dB$
B

$(B_{0} + 3) dB$
C

$(B_{0} + 6) dB$
D

$4 B_{0} dB$

Solution

If intensity is doubled the sound level is increased by 3.0 dB. i.e., it becomes ( $B_{0}$ + 3) decibels. Hence when intensity is increased four times, level becomes ( $B_{0}$ + 6) decibels'

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