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1. 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
2. They are out of phase at X. Therefore there is destructive interference at X and as such the path difference is wavelength/2
3. (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?
4. 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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