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?

Explanation

(i) `f=40MHz`
`c=flambda rArr lambda =(c)/(f)`
`rArr lambda =(3xx10^(8))/(40xx10^(6))=7.5m`
(ii) Time period `T=(1)/(t)`
`rArr T=(1)/(40xx10^(6))=0.25mus`
(iii) As `(E_(0))/(B_(0))= c rArr B_(0)=(E_(0))/(c)`
`rArr B_(0)=(750)/(3xx10^(8))=2.50 muT`