Question

A wave represented by the given equation y = a cos (kx – ωt) is superposed with another wave to form a stationary wave such that the point x = 0 is a node. The equation for the other wave is

(a) y = a sin (kx + ωt)

(b) y = -a cos (kx + ωt)

(c) y = -a cos(kx - ωt)

(d) y = -a sin(kx - ωt)

Answer 1

Correct option: (b) y = -a cos (kx + ωt)

Explanation:

For x = 0, A = 0, which represents node.