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Electromagnetic Field Theory - Engineering

Q1:

When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called

A scattering

B polarisation

C absorption

D dispersion

ANS:B - polarisation

Hello, sir.

In phase velocity Vp=W(frequency)/beta. Where beta is the non-linear relation of frequency.
And we know that non-linear relation, show dispersive nature of wave so.

The answer should be (d). And if the answer is (b) then please explain it.