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Q.

Which of the following expressions represents a simple harmonic progressive wave

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a

y = A sin wt

b

y = A sin wt cos kx

c

y = A sin (wt - kx)

d

y = A cos kx

answer is C.

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Detailed Solution

General equation of wave motion should be represented by
y=f(ax±bt) or f(at±bx)
When y is a sine or cosine function such as 

y=asin(ωt−kx) or y=acos(ωt−kx)
it is called simple harmonic progressive wave.

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