what is phase in physics?
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In physics, the term phase has two distinct meanings. ... 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.
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★ Phase :
All the points on a wave which are in the same state of vibration are said to be in the same phase. Now, see the attached image.
(a) Points B, F and J are in the same phase – all lie on the crests.
(b) Points D and H are in the same phase both lie on the troughs.
(c) Points A, E and I are in the same phase. All these points are just about to start their vibration in the upward direction from their mean positions.
(d) Points C, G and K are in the same phase. All these points are just about to start their vibration in the downward direction from their mean positions.
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