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Byju's Answer
Standard XI
Physics
The Loudness
If the intens...
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,
Δ
β
=
10
log
10
(
I
I
0
)
From the data given in the question,
20
=
10
log
10
(
I
I
0
)
[
∵
Δ
β
=
20
dB
]
⇒
I
I
0
=
10
2
=
100
⇒
I
=
100
I
0
Comparing with
I
=
x
I
0
we get,
x
=
100
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