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A sound increases its decibel reading fr...

A sound increases its decibel reading from `20 "to" 40 dB`. This means that the intensity of the sound

A

is doubled

B

is `20 `times greater

C

is `100` times greater

D

is the old intensity `20`

Text Solution

Verified by Experts

The correct Answer is:
C
The decibel scale is logarithmic `dB = 10 log(I//I_(0))`. Each increase in intensity by a power of ten increases the decibel reading by `10 units`. Hence , to increase the decibel reading by `20` ,there should be an increase in the intensity of `10 xx10 = 100`.
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