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Question

Shown in the figure, are three waves originating from a point source. Points A,B,C lie on trough while points D,E,F lie on crest of the wave. A wavefront emitting from O may pass through,


A
Either A,B,C or D,E,F
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B
A,B,F
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C
Either A,E,C or B,D,F
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D
Either A,D,E or B,C,F
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Solution

The correct option is A Either A,B,C or D,E,F

A surface on which, all the particles/points of the medium, are in the same phase, is called a wavefront.

Here, points A, B and C are in the same phase and points D, E and F are also in the same phase.

Hence, a wavefront emitting from O may pass through either from points A,B,C or points D,E,F.

Hence, (D) is the correct answer.

Why this question?Note:- For a point source the wavefront is spherical.

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