If the phase difference between the two waves is $2\pi$ during superposition, then the resultant amplitude is

If the phase difference between the two waves is $2\pi$ during superposition, then the resultant amplitude is
  1. maximum
  2. minimum
  3. maximum or minimum
  4. None of these

Solution

Phase difference of $2\pi$ means constructive interference. So, resultant amplitude will be maximum.

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