Q87 / 90 · JEE Main 2022 (25 Jul Shift 2) · Physics

Two waves executing simple harmonic motion travelling in the same direction with same amplitude and frequency are superimposed. The resultant amplitude is equal to the 3 times of amplitude of individual motions. The phase difference between the two motions is _____ (degree)

Correct answer: 60

Solution

When two waves of the same frequency superimpose, the resultant amplitude is given by

Aresultant =A12+A22+2A1A2cosϕ

⇒3 A=A2+A2+2A2cosϕ

⇒3A2=2A2+2A2cosϕ

⇒cosϕ=12

∴ϕ=60°

∴Phase difference =60 degree

Hence, the correct answer is 60.

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