Physics (AS & A Level) · May / June 2026 · Paper 12 · Question 29

Waves are emitted by two coherent sources. The two waves meet at point X where they have a constant phase difference of 180°. At point X, the amplitude of one of the waves is 0.50 m and the amplitude of the other wave is 0.30 m. The waves superpose. What is the amplitude of the resultant wave at point X?

1. A0 m
2. B0.20 m
3. C0.40 m
4. D0.80 m

As printed in the paper