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Wave speed is a wave property, which may refer to absolute value of: . phase velocity, the velocity at which a wave phase propagates at a certain frequency; group velocity, the propagation velocity for the envelope of wave groups and often of wave energy, different from the phase velocity for dispersive waves
For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water, also known as a capillary wave. The expanding ring of waves is the wave group or wave packet , within which one can discern individual waves that travel faster than the group as a whole.
For example, in the Cartesian ... For an incident wave traveling from one medium (where the wave speed is c 1) to another medium (where the wave speed is c 2), one ...
In this example, there are 5 + 3 / 4 waves between two wave group nodes in space, while there are 11 + 1 / 2 waves between two wave group nodes in time. North Pacific storm waves as seen from the NOAA M/V Noble Star, Winter 1989.
For example, if an electron wave packet is initially localized in a region of atomic dimensions (i.e., 10 −10 m) then the width of the packet doubles in about 10 −16 s. Clearly, particle wave packets spread out very rapidly indeed (in free space): [17] For instance, after 1 ms, the width will have grown to about a kilometer.
The phase velocity of a wave is the rate at which the wave propagates in any medium. This is the velocity at which the phase of any one frequency component of the wave travels. For such a component, any given phase of the wave (for example, the crest) will appear to travel at the phase velocity.
For example, a 10 20 Hz gamma ray photon has 10 19 times the energy of a 10 1 Hz extremely low frequency radio wave photon. ... where v is the speed of the wave ...
For example, while sound travels at 343 m/s in air, it travels at 1481 m/s in water (almost 4.3 times as fast) ... The speed of shear waves, which can occur only in ...