The electric field part of an electromagnetic wave in a medium is represented by
Eₓ=0; E_y=2.5 N/C cos [(2π×10⁶ (rad)/s)t-(π×10⁻² (rad)/m)x]; E_z=0
The wave is

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(2) moving along x-direction with frequency 10⁶ Hz and wavelength 200 m.. Read off ω=2π×10⁶ rad s⁻¹ and k=π×10⁻² rad m⁻¹. Frequency: f=ω/(2π)=10⁶ Hz. Wavelength: λ=(2π)/k=(2π)/(π×10⁻²)=200 m. The phase is written ω t-kx, so a point of constant phase moves towards +x. The field itself points along y, which is what makes the wave transverse, not what sets its direction of travel.

The electric field part of an electromagnetic wave in a medium is represented by
Eₓ=0; E_y=2.5 N/C cos [(2π×10⁶ (rad)/s)t-(π×10⁻² (rad)/m)x]; E_z=0
The wave is

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Why the other options are wrong

The electric field part of an electromagnetic wave in a medium is represented byEₓ=0; E_y=2.5 N/C cos [(2π×10⁶ (rad)/s)t-(π×10⁻² (rad)/m)x]; E_z=0The wave is

Step-by-step solution

Why the other options are wrong

The electric field part of an electromagnetic wave in a medium is represented by
Eₓ=0; E_y=2.5 N/C cos [(2π×10⁶ (rad)/s)t-(π×10⁻² (rad)/m)x]; E_z=0
The wave is