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Standard XII
Physics
NCERT
Question

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

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Solution
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Wave travel along z-direction.
Electric and magnetic field are in XY plane and perpendicular to each other.
λ=c/ν=10 m

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