Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 27

Two loudspeakers X and Y emit sound waves that are in phase and of wavelength 0.75 m. An observer O is able to stand anywhere on a straight line that passes through X and Y, as shown. The observer stands at a point where the sound waves from X and Y meet in phase. What could be the distances OY and XY?

1. Adistance OY / m 1.25, distance XY / m 3.50
2. Bdistance OY / m 2.00, distance XY / m 2.75
3. Cdistance OY / m 2.75, distance XY / m 2.00
4. Ddistance OY / m 3.25, distance XY / m 1.50

As printed in the paper