Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 29

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?

1. A\frac{\lambda}{8}
2. B\frac{\lambda}{4}
3. C\frac{\lambda}{2}
4. D\lambda

As printed in the paper