Home Physics Wave and Sound Intensity of Sound, Decibel Scale and Interference For a sound source of intensity I W/m 2 , co…
Physics Wave and Sound Intensity of Sound, Decibel Scale and Interference MCQ (Single Correct)

For a sound source of intensity I W/m 2 , corresponding sound level is B 0 decibel. If the intensity is increased to 4I, new sound level becomes approximately:

A
2B 0 dB
B
(B 0 + 3)dB
C
(B 0 + 6)dB
D
4B 0 dB

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The correct answer is:
C

If intensity is doubled the sound level is increased by 3.0 dB. i.e., it becomes decibels. Hence when intensity is increased four times, level becomes decibels.

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