The electric field of an electromagnetic wave in free space is given by – `vec(E )=10cos(10^(7)t+kx)hat(j) V//m`, where t and x are in seconds and metres respectively. It can be inferred that -
(a) The wavelength `lambda` is 188.4 m
(b) The wave number k is 0.33 rad / m
(c) The wave amplitude is 10 V / m
(d) The wave is propagating along + x direction Which one of the following pairs of statements is correct ?

Options

A. (iii) and (iv)
B. (i) and (ii)
C. (ii) and (iii)
D. (i) and (iii)

Answer

D

Explanation

Both electric and magnetic field vectors are parallel to each other perpendicular to the direction of propagation of wave.