Physics (AS & A Level) · May / June 2023 · Paper 13 · Question 28

Two coherent electromagnetic waves are travelling in a vacuum. The two waves meet at a point. At this point, the two waves have different intensities. Which statement about the waves is not correct?

1. AThey have a constant phase difference at the point.
2. BThey have the same amplitude at the point.
3. CThey have the same frequency.
4. DThey travel at the same speed.

As printed in the paper