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A plane electromagnetic wave travels in ...

A plane electromagnetic wave travels in vacuum along z-direction. What can you sayabout the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

Text Solution

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Since, electromagnetic waves are transverse in nature. The electric and magnetic fields are mutually perpendicular as well as perpendicular to the direction of propagation of the wave, therefore `vec(E ) and vec(B)` are in XY plane. We are given: `v= 30 MHz= 30 xx 10^(6)Hz`
`therefore lamda= (c )/(v)= (3 xx 10^(8))/(30 xx 10^(8))= 10m`
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