`A` and `B` are two points on water surface where waves are generated. What is the phase diff. if (i) `A` and `B` are on same wavefront separated by distance `lambda`. (ii) A and `B` are on successive crests separated by distance `2 lambda`. (iii) A and B are on successive troughs separated by distance `3 lambda`.
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(i) Zero (ii) `2pi` radian (iii) `2pi` radian.
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