A) \[\text{1 }\times \text{ 1}0.\text{4 m}\]
B) \[\text{1 }\times \text{ 1}0.\text{3 m}\]
C) \[\text{1 }\times \text{ 1}0.\text{2 m}\]
D) \[\text{1}00\text{ m}\]
Correct Answer: C
Solution :
\[m=\frac{I}{O}=\frac{f}{u}\] \[\Rightarrow \] \[I=\frac{O}{u}\times f\] \[=\frac{1.4\times {{10}^{9}}}{1.5\times {{10}^{11}}}\times 1\,\,m\] \[\mathbf{=1\times 1}{{\mathbf{0}}^{\mathbf{-2}}}\mathbf{m}\].
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