A wave travels on a light string

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A wave travels on a light string. The eqn of wave y=Asin⁡(ωt−kx+30∘)y = A \sin (\omega t - kx + 30^\circ) . It is reflected from a heavy string fixed to an end of light string at x=0x = 0 . If 64% of incident energy is reflected. The eqn of reflected wave is:

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