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Q.

Two simple harmonic waves having equal amplitudes of 8 cm and equal frequency of 10 Hz are moving along the same direction. The resultant amplitude is also 8 cm. The phase difference between the individual waves is ______degree.

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answer is 120.

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Detailed Solution

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R2=A12+A22+2A1A2cos⁡ϕ⇒A2=A2+A2+2A2cos⁡ϕ⇒cos⁡ϕ=−12⇒ϕ=120∘

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