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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×10−2)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 mThe form of wave is EZ=E0(ωt−kx) which represents the direction of propagation of wave is positive x direction. Here , ω=2π×106⇒2πν=2π×106⇒ν=106 Hz Also, k=2πλ ⇒2πλ=π×10−2 ⇒λ = 2ππ×10−2=2×102=200 m.

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