(A) : If two waves of same amplitude, produce a resultant wave of same amplitude, then the phase difference between them will be 120°.
(R) : The resultant amplitude of two waves is equal to sum of amplitude of two waves.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is C.

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Detailed Solution

$Resultant amplitude is given by A_{net} = 2 Acos (\frac{△ ϕ}{2})$

$when △ ϕ = 120 °$

$A_{net} = 2 Acos \frac{120}{2} = A$

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