Discussion
Dispersion in a medium means that
Answer: A
Correct answer: the phase velocity depends on frequency
In a dispersive medium different frequency components travel at different phase velocities, so a pulse, which is a sum of many frequencies, spreads out as it propagates. That is distinct from attenuation, which reduces the amplitude without changing the shape, and it is why dispersion rather than loss sets the reach of a long optical fibre link.
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