CAPE Physics Unit 1 · 2007 (Specimen) · Paper 1 · Question Q23

Items 23 refers to the following diagram. Two wave sources X and Y are positioned as shown 50\text{ mm} and 120\text{ mm} from a point P. The two sources produce waves which are in phase and which both have wavelength of 20\text{ mm}. The phase difference between the waves arriving at P is

1. (A)180^\circ
2. (B)360^\circ
3. (C)45^\circ
4. (D)90^\circ

This question uses a figure or table from the paper — you'll see it when you practise.