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Question

The electric field part of an electromagnetic
wave in a medium is represented by Ex=0;Ey=2.5Nccos[(2π×106)t(π×102)x];Ez=0;
By the above characteristic, the wave is

A
moving along x direction with frequency 106Hz and wavelength 100 m.
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B
moving along x direction with frequency 106 Hz and wavelength 200 m.
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C
moving along y direction with frequency 106 Hz and wavelength 100 m.
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D
moving along y direction with frequency 2π ×106 Hz and wavelength 200 m.
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Solution

The correct option is A moving along x direction with frequency 106Hz and wavelength 100 m.
Ey=2.5Nc{(2π×106)t(π×106)x };Ez=0
The wave is moving in the positive direction of x. This is the form Ey=E0(wtkx)ω=2π×106 rad s12πv=2π×106 rad s1v=106 s12πλ=k2πλ=π×102λ=2ππ×102=200 m.

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