A wave travels on a light string

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

A wave travels on a light string. The equation of the waves is y=Asin⁡(kx−ωt+30∘)y = A \sin(kx - \omega t + 30^\circ) . It is reflected from a heavy string tied to an end of the light string at x=0x = 0 . If 64% of the incident energy is reflected, then the equation of the reflected wave is (1) y=0.8Asin⁡(kx−ωt+30∘+180∘)y = 0.8 A \sin(kx - \omega t + 30^\circ + 180^\circ) (2) y=0.8Asin⁡(kx+ωt+30∘+180∘)y = 0.8 A \sin(kx + \omega t + 30^\circ + 180^\circ) (3) y=0.8Asin⁡(kx−ωt−30∘)y = 0.8 A \sin(kx - \omega t - 30^\circ) (4) y=0.8Asin⁡(kx−ωt+30∘)y = 0.8 A \sin(kx - \omega t + 30^\circ)

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