Show, by giving a simplex example, how EM waves carry energy and momentum.

1

(a)

Consider a plane perpendicular to the direction of propagation of the wave. An electric charge, on the plane, will be set in motion by the electric and magnetic fields of em wave, incident on this plane.This illustrates that em waves carry energy and momentum.

Why is the Quantity \({ \varepsilon }_{ 0 }d\Phi _{ E }/dt\) called the displacement current?

1

(a)

Due to change in electric field

What is the ratio of speed of infrared and ultraviolet rays in vacuum?

1

(a)

Same as velocity of light

An electromagnetic wave consists of oscillating electric and magnetic fields. What is the phase relationship between these oscillations?

1

(a)

90 degree

If the area of the TV telecast is to be doubled then what will be the height of the transmitting antenna ?

1

(a)

doubled