A plane electromagnetic wave of frequency 40 MHz travels in free space in the X-direction. At some point and at some instant, the electric field $\vec{E}$ has its maximum value of 750 N/C in Y-direction.
The time period of the wave will be:
Answer & explanation
Correct answer: option 3
$ T = \frac{1}{\nu} = \frac{1}{4\times 10^7} = 0.025\mu s$