Two coherent progressive waves from different sources meet at a point.
Which condition must be satisfied for there to be zero resultant amplitude at the point where the waves meet?
1 )
The two waves must be emitted from their sources with the same intensity.
2 )
The two waves must be in phase with each other at the point.
3 )
The two waves must be travelling in opposite directions.
The two waves must have the same amplitude at the point.
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