A) 4.477 dB
B) 0.4477 dB
C) 44.77 dB
D) 44.7 dB
Correct Answer: C
Solution :
\[dB=10\log \left[ \frac{3\times {{10}^{-8}}}{1\times {{10}^{-12}}} \right]\] \[=101og(3\times {{10}^{4}})\] \[=10[4+\log 3]\] \[=10[4+0.477]\] \[=10\times 4.477\] \[=44.77\,\,dB\]You need to login to perform this action.
You will be redirected in
3 sec