The electric field part of an electromagnetic wave in a medium is represented by Ex=0; Ey=2.5NCcos[(2π×106rad/s)t−(π×10−2rad/m)x]; Ez=0. The wave is :
A
Moving along −x direction with frequency 106Hz and wavelength 200m.
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B
Moving along +y direction with frequency 2π×106Hz and wavelength 200m.
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C
Moving along +x direction with frequency 106Hz and wavelength 100m.
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D
Moving along +x direction with frequency 106Hz and wavelength 200m.
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Solution
The correct option is D Moving along +x direction with frequency 106Hz and wavelength 200m. Ey=2.5NCcos[(2π×106t)−π×10−2x] direction +X axis wavelength λ=2πk=2ππ×10−2=200m f=ω2π=2π×1062π=106Hz