Physics (AS & A Level) · Oct / Nov 2019 · Paper 12 · Question 27

An outdoor concert has two large speakers beside the stage for broadcasting music. In order to test the speakers, they are made to emit sound of the same wavelength and the same amplitude. The curved lines in the diagram represent wavefronts. Where is the loudest sound heard?

1. AA
2. BB
3. CC
4. DD

As printed in the paper