Wave Motion 5 Question 20

20. The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion is (are)

(a) coskxsinωt

(b) k2x2ω2t2

(c) cos2(kx+ωt)

(d) cos(k2x2ω2t2)

(1987,2M)

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Answer:

Correct Answer: 20. (a, c)

Solution:

  1. (a) and (c) options satisfy the condition;

2yx2=( constant )2yt2



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