Q.

If wave y=Acos(ωt+kx) Is moving along x- axis, the shapes of a pulse at t=0 and t=2s.

A. are different
B. are same
C. may not be the same
D. unpredictable
Answer» B. are same
Explanation: the shapes of y-x graph remains the same at t=0 and t=2s.
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