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Standing wave can be produced :...

Standing wave can be produced :

A

on a string clampled at both ends

B

on a string clamped at one end and free at the other

C

when incident wave gets reflected from a wall

D

when two identical waves with a phase different of a `pi` are moving in the same direction

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The correct Answer is:
A, B, C
Standing waves can be produced only when two similar type of waves (same frequency and speed, but amplitude may be different) travel in opposite directions.
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