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When two waves of the same amplitude and frequency but having a phase difference of  , travelling with the same speed in the same direction (positive x), interfere, then

1. their resultant amplitude will be twice that of a single wave but the frequency will be same
2. their resultant amplitude and frequency will both be twice that of a single wave
3. their resultant amplitude will depend on the phase angle while the frequency will be the same
4. the frequency and amplitude of the resultant wave will depend upon the phase angle. PG #3

Correct answer: their resultant amplitude will depend on the phase angle while the frequency will be the same

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