Q.

If the intensity of sound is doubled, the intensity level will increase by

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a

1 dB

b

2dB

c

3dB

d

4dB

answer is C.

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Detailed Solution

Here I2I1=2  or  I2/I0I1/I0=2 10log10⁡I2I0−10log10⁡I1I0=10log10⁡2 or dB2−dB1=3 ∵log0⁡2≅0⋅3
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If the intensity of sound is doubled, the intensity level will increase by