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    Two wave sources are oscillating in phase. Each source produces a wave of wavelength λ. The
    two waves from the sources meet at point X with a phase difference of 90°.
    What is a possible difference in the distances from the two wave sources to point X?

    This question is from 9702/12/M/J/2017
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    They are out of phase at X. Therefore there is destructive interference at X and as such the path difference is wavelength/2
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    (Original post by GreatKhan)
    They are out of phase at X. Therefore there is destructive interference at X and as such the path difference is wavelength/2
    Hi! The answer scheme says it's wavelength/4. Can you please show me the working?
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    The question asks for the distance between the two particles and as it says that the path difference is 90 degree so it must an antinode and a nodeAnd the separation of the particles between a node and an antinode is wavelength/4
 
 
 
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