What do you understand by phase velocity and group velocity?
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The phase velocity of a wave is the rate at which the phase of the wave propagates in space. This is the velocity at which the phase of any one frequency component of the wave travels.
The group velocity of a wave is the velocity with which the overall shape of the wave's amplitudes (known as the modulation or envelpe of the wave )propagates through space.
The group velocity of a wave is the velocity with which the overall shape of the wave's amplitudes (known as the modulation or envelpe of the wave )propagates through space.
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Waning Crescent: In the Northern Hemisphere,we see the waning crescent phase as a thin crescent of light on the left. The Moon displays these eightphases one after the other as it moves through its cycle each month. It takes 27 days for the Moon to orbit Earth. Thatmeans the Moon's cycle is 27 days long.
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