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A plane electromagnetic wave of frequenc...

A plane electromagnetic wave of frequency 40 MHz travels in free spae in the x-direction. At some point and at some instant, the electric field `vecE` has its maximum value of 750 N/C in y-direction.
(i) What is the wavelenght of the wave ?
(ii) What is the period of the wave?
(iii) What is the amplitude of magnetic field?

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