Question

For sound waves, what's the phase and group velocity? Give numerical values.

Answer #1

**Phase velocity :**

The wave propagates with the velocity of the points that have the same phase position in space.

Phase velocity can be given as :

C_{ph}= . = /K

The phase velocity ( speed of sound) of sound waves is : 331 m/s in air

**Group velocity :**

Group velocity is defined by the equation :

v_{g} = /k

If is directly proportional to k , then group velocity would be equal to the phase velocity

For
sound waves, the group and phase velocities satisfy the
relation

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Group of answer choices
This problem cannot be solved without knowing the wavelengths of
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a wave with zero amplitude.
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