The figure shows four progressive waves A, B, C, and D with their phases expressed with respect to the wave A. It can be concluded from the figure that
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a
The wave C is ahead by a phase angle of π/2 and the wave B lags behind by a phase angle of π /2
b
The wave C lags behind by a phase angle of π/2 and the wave B is ahead by a phase angle of π /2
c
The wave C is ahead by a phase angle of π and the wave B lags behind by a phase angle of π
d
The wave C lags behind by a phase angle of π and the wave B ahead by a phase angle of π
answer is B.
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Detailed Solution
Equation of A, B, C and D are yA=Asinωt, yB=Asin(ωt+π/2)yC=Asin(ωt−π/2), yD=Asin(ωt−π)It is clear that wave C lags behind by a phase angle of π/2 and the wave B is ahead by a phase angle at π/2.