Question

define phase according to physics(sound)

Answer 1

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In physics, the term phase has two distinct meanings. The first is a property of waves. If we think of a wave as having peaks and valleys with a zero-crossing between them, the phase of the wave is defined as the distance between the first zero-crossing and the point in space defined as the origin.....

They are completely out of phase if the waves are 180° apart. The resulting amplitude is zero - as shown in Illustration below. Phase can also be an expression of relative displacement between or among waves having the same frequency - the "phase difference".

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Answer 2

In sinusoidal functions or in waves, "phase" has two different, but closely related, meanings. One is the initial angle of a sinusoidal function at its origin and is sometimes called phase offset or phase difference. Another usage is the fraction of the wave cycle that has elapsed relative to the origin.