Question

When light propagates in vacuum there is an electric field and a magnetic field. These fields
(a) are constant in time
(b) have zero average value
(c) are perpendicular to the direction of propagation of light.
(d) are mutually perpendicular.

Answer 1

(b) have zero average value

(c) are perpendicular to the direction of propagation of light.

(d) are mutually perpendicular.