Physics (AS & A Level) · May / June 2024 · Paper 11 · Question 30

Microwaves are emitted from two sources at points X and Y. The two waves meet at point Z. The diagram shows the paths of the two waves. The waves emitted from points X and Y are coherent. What is a direct consequence of the two waves being coherent?

1. AThere is a constant difference in the path lengths YZ and XZ.
2. BThere is a constant difference in phase between the two waves at Z.
3. CThere is a constant non-zero difference in frequency of the two waves at Z.
4. DThere is a constant non-zero difference in amplitude of the two waves at Z.

As printed in the paper