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The electric field of a plane electromag...

The electric field of a plane electromagnetic wave in vacuum is represented by `E_x = 0, E_y = 0.5 cos [2pi xx 10^8( t —x/c)] and vec E_z = 0` the wavelength of the wave, is

A

1 m

B

2 m

C

3 m

D

4 m

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