difference between phase velocity and group velocity
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phase velocity- the speed of propagation of a sine wave or a sinusoidal component of a complex wave, equal to the product of its wavelength and frequency.
group velocity- the speed at which the energy of a wave travels.
group velocity- the speed at which the energy of a wave travels.
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Waves can be in the group and such groups are called wave packets, so the velocity with a wave packet travels is called group velocity. The velocity with which the phase of a wave travels is called phase velocity.
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