A) \[200\,\,Hz\]
B) \[500\,\,Hz\]
C) \[100\,\,Hz\]
D) \[300\,\,Hz\]
Correct Answer: C
Solution :
\[\text{v=}\frac{\text{I}}{\text{T}}\text{=}\frac{\text{20}\,\,\text{oscillations}}{\text{0}\text{.2}\,\,\text{s}}\text{=100}\,\,\text{Hz}\]
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