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Fully constructive interference between ...

Fully constructive interference between two sinusoidal waves of the same frequency occurs only il they

A

travel in opposite directions and are in phase.

B

travel in opposite directions and are `180^@` out of phase.

C

travel in the same direction and are in phase,

D

travel in the same direetion and are `180^@` out of phase.

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The correct Answer is:
C
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