JEE PHYSICS MCQ: WAVES

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Analyzing +4 | -1

A travelling wave

y=A \sin (k x-\omega t+\theta)

passes from a heavier string to a lighter string. The reflected wave has amplitude

0.5 \mathrm{~A}

. The junction of the strings is at

x=0

. The equation of the reflected wave is:

View answer and explanation

Correct option: D

y^{\prime}=-0.5 A \sin (k x+\omega t-\theta)

Option D (

y^{\prime}=-0.5 A \sin (k x+\omega t-\theta)

) is correct because the wave is reflected from a rarer medium, so there is no phase change, and the direction of propagation is reversed.

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