What is the phase speed?
When studying wave speed or as fast waves move, there are two different types that can be calculated, which is the phase speed and speed of the group. Phase speed measures one wave speed, while the speed of the group measures the velocity of the wave packet or envelope. A wave pack is a group of waves that move as a single unit and therefore can be measured as the only entity. The phase speed measurement includes measurement of the distance movements of the distance in the time period. The wavelength is the distance from the ridge or the top of one wave to the ridge of another wave. Phase speeds and group speeds may not be the same in the wave package.
between phase and group speeds can be observed several different relationships. When phase and group speeds are the same, each wave of components moves with the whole packet or the shape of the wool moves as one unit. Liphase speed equals the negative speeds of the group, then the waves of the components move in the opposite direction to the wave package. Waves with phase ryeChvosts greater than the speed of the group will move faster than the envelope. The opposite is true when the speed of the group is larger. In this case, the waves of the components move more slowly than the complete envelope.
In addition to the above scenarios, either phase speed or group speed can be equal to zero. When this happens, either the waves of the components or the wave packet are stationary. With phase speed zero, the wave package moves through stationary component waves. Group speed zero means that the envelope is still and the waves of the components move.
phase speed will vary for different types of media. This is because the media features play a role, so light waves, sound waves and waves in different liquids can react differently. Wave frequencies can also have a direct effect on phase speed, as different frequencies of waves usually travel at different speeds. Phase speed of waves can also be measured in a vacuum. ItIt should be taken into account because the permeability and permittivity of the vacuum will have a direct effect on the phase and group speed of the measured media.