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Question

The electric field part of an electromagnetic wave in a medium is represented by
Ex=0, Ey=0,
EZ=2.5((2π×106)t(π×102)x]
The wave is

A
moving along positive x direction with frequency 106 Hz and wavelength 100 m
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B
moving along negative x direction with frequency 106 Hz and wavelength 200 m
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C
moving along positive x direction with frequency 106 Hz and wavelength 200 m
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D
moving along positive z direction with frequency 106 Hz and wavelength 200 m
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Solution

The correct option is C moving along positive x direction with frequency 106 Hz and wavelength 200 m
The form of wave is EZ=E0(ωtkx) which represents the direction of propagation of wave is positive x direction.
Here , ω=2π×1062πν=2π×106ν=106 Hz
Also, k=2πλ 2πλ=π×102
λ = 2ππ×102=2×102=200 m.

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