A plane electromagnetic wave is given by and propagates along the -direction

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A plane electromagnetic wave is given by

E(x,t)=E_0\sin(kx-\omega t)

and propagates along the

+x

-direction. Two points

A

and

B

on the

x

-axis are separated by

\dfrac{\lambda}{4}

. (i) What is the phase difference between the electric fields at

A

and

B

at the same instant? (ii) Do the fields at these two points oscillate in phase or out of phase? Give a brief reason.