The electric field part of an electromagnetic wave in a medium is represented by
`E_(x)=0,`
`E_(y)=2.5(N)/(C) cos[(2pixx10^(6)(rad)/(m))t-(pixx10^(-2)(rad)/(s))x]`
`E_(z)=0`.
The wave is

Options

A. moving along x direction x direction with frequency `10^(6)Hz` and wave length 100 m.
B. moving along x direction with frequency `10^(6)Hz` and wave length 200 m.
C. moving along -x direction with frequency `10^(6)Hz` and wave length 200m.
D. moving along y direction with frequency `2pixx10^(6)Hz` and wave length 200 m.

Answer

B

Explanation

Comparing with the equation of wave.
`E_(y)=E_(0)cos (omegat-kx)`
`omega=2pif=2pixx10^(6)" "therefore" "f=10^(6)Hz`
`(2pi)/(lambda)=k=pixx10^(-2)m^(-1), lambda=200m`