Question

Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space ?

• A. Electric and magnetic fields have a phase difference of $\pi /2$
• B. The energy contribution of both electric and magnetic fields are equal
• C. The direction of propagation is in the direction of electric field E
• D. The pressure exerted by the wave is the product of energy density and the speed of the wave
• E. The speed of the wave is B/E

Answer 1

The correct option is B The energy contribution of both electric and magnetic fields are equal

The energy contribution of both electric and magnetic fields are equal property of a monochromatic, plane electromagrietic wave in free space.