A) 1000
B) 2
C) 100
D) 4
Correct Answer: A
Solution :
\[L=10\,{{\log }_{10}}\frac{I}{{{I}_{0}}}\] \[60=10\,{{\log }_{10}}\frac{{{I}_{1}}}{{{I}_{0}}}\] \[\Rightarrow \] \[\Rightarrow \frac{{{I}_{1}}}{{{I}_{0}}}={{10}^{6}}\] ... (i) Similarly, \[30=10\,{{\log }_{10}}=\frac{{{I}_{2}}}{{{I}_{0}}}\] \[\frac{{{I}_{2}}}{{{I}_{0}}}={{10}^{3}}\] ... (ii) Dividing Eq. (i) by Eq. (ii), we get \[\frac{{{I}_{1}}}{{{I}_{2}}}=1000\]
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