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

_When the phase velocity of an EM wave depends on frequency in any med

1.	_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
Answer» C. Absorption