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Question

If the intensity is increased by a factor x, sound level is increased by 20 dB. Then, the value of x is

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Solution

We know that, Loudness (β) is related to intensity of sound (I) as,
Δβ=10log10(II0)
From the data given in the question,

20=10log10(II0) [Δβ=20 dB]

II0=102=100

I=100I0

Comparing with I=xI0 we get, x=100

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