A) 1000
B) 10000
C) 10
D) 100
Correct Answer: D
Solution :
Let intensity of sound be I and I?. Loudness of sound initially \[{{\beta }_{1}}=10\,\,\log \,\left( \frac{I'}{{{I}_{0}}} \right)\] \[{{\beta }_{2}}\,\,=\,\,10\,\,\log \,\left( \frac{I}{{{I}_{0}}} \right)\] Given \[{{\beta }_{2}}-{{\beta }_{1}}=20\] \[\therefore \,\,\,\,20\,\,=\,\,\,10\,\,log\,\left( \frac{I'}{I} \right)\] \[I'=100\,I\]
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