The electric field of an electromagnetic wave in free space is given by vector E = 10 cos(107 t + kx)j V/m, where t and x are in seconds and metres respectively. It can be inferred that
(1) the wavelength λ is 188.4 m.
(2) the wave number k is 0.33 rad/m.
(3) the wave amplitude is 10 V/m.
(4) the wave is propagating along +x direction.
Which one of the following pairs of statements is correct?
(a) (3) and (4)
(b) (1) and (2)
(c) (2) and (3)
(d) (1) and (3)
