question_answer 10)

In a plane electromagnetic wave, the electricfield oscillates sinusoidally at a frequency ofand amplitude . (a) What is the wavetehgth of the wave? (b) What is the amplitude of the oscillatingmagnetic field? (c) Show that the average energy density ofthe E field equals the average energydensity of the B field. .  

Answer:

(a) Using we get                                 (b) Using  we get                 (c) Average energy density of the electric field,  and Average energy density of the magnetic field, Also and i.e., Then i.e.,