A) \[5\times {{10}^{9}}s\]
B) \[4\times {{10}^{9}}s\]
C) \[5\times {{10}^{9}}{{s}^{-1}}\]
D) \[4\times {{10}^{9}}{{s}^{-1}}\]
Correct Answer: C
Solution :
\[\text{Frequency}\,\text{(v)}\,\,\text{=}\,\frac{\text{1}}{\text{period}}\] \[=\frac{1}{2.0\times {{10}^{-10}}s}\] \[=5\times {{10}^{9}}{{s}^{-1}}\]
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