Statement-1: All points on a wavefront vibrate in same phase with same frequency
Statement-2: Two sources are said to be coherent if they produce waves of same frequency with a constant phase difference.

Statement-1 is false, Statement -2 is true

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Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1

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Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for statement-1

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Statement-1 is true, Statement-2 is false

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Solution

The correct option is A Statement-1 is false, Statement -2 is true
All points on the wavefront have the same temporary displacement. Then need not be oscillating with the same frequency and constant phase difference.
Two wave sources are said to be coherent if they produce waves of same frequency and constant phase difference.
Hence assertion is incorrect, reason is correct. Option A.

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Similar questions

STATEMENT-1 : Two coherent point sources of light having nonzero phase difference are seperated by small distance. Then on the perpendicular bisector of line segment joining both the point sources, constructive interference cannot be obtained.
STATEMENT-2 : For two waves from coherent point sources to interfere constructively at a point, the magnitude of their phase difference at that point must be $2 m π$ ( where m is a nonnegative integer).

Q. Statement