JEE (Advanced) 2015 Paper-2 Question 4

Question 4

Four harmonic waves of equal frequencies and equalintensities $$I_0$$ have phase angles $$0, \frac{\pi}{3}, \frac{2\pi}{3}$$ and $$\pi$$. When they are superposed, the intensity of the resulting wave is $$nI_0.$$ The value of n is

Correct Answer: 3

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