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KVPY SX SB Exam 2015 Question Paper
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© examsnet.com
Question : 39
Total: 120
The intensity of sound during the festival season increased by 100 times. This could imply a decibel level rise from -
20 to 120 dB
70 to 72 dB
100 to 10000 dB
80 to 100 dB
Validate
Solution:
Loudness of sound in decibel Loudness of sound in decibel
d
B
=
10
log
10
(
I
I
0
)
when intensity of sound become 100 I then new decibel level =
d
B
′
=
10
log
10
(
100
I
I
0
)
dB' – dB = 10 log
10
100
dB' – dB = 20
∴ decibel rise by 20 dB
only one option i.e. 80 to 100 dB match with it
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