The document discusses wave speed and phase speed. Wave speed is affected by the medium, with sound waves traveling fastest in solids, then liquids, and slowest in gases. The elastic properties of a medium have a greater influence on wave speed than density. Phase velocity is the rate at which the wave's phase propagates, calculated as the frequency times the wavelength. It can differ from group speed in dispersive mediums.

1. Wave speed and Phase speed

2. #Wave Speed

3. Effect of medium
•Sound wave→Faster in solid
→then liquid and then gases.
•While the density of medium also effects the speed of
sound,the elastic properties have a greater influence on the
medium.
•The density of medium is the second factor that effect the
speed of sound.

4. • The phase velocity of a wave is the rate at which the
phase of the wave propagated,the product of the
frequency times the wavelength.
• This is the quantity that is determined by methods using
interference.
• In a dispersive medium it differs from the group speed.
Also called:wave speed or wave velocity.
Phase Speed