Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 29

Two loudspeakers are connected to the same signal generator. The signal generator produces a single frequency. The loudspeakers face each other so that a stationary sound wave is set up in the region between the loudspeakers. A microphone is connected to a cathode-ray oscilloscope (CRO) and positioned between the two loudspeakers. The microphone is moved along a line joining the two loudspeakers. The signal on the CRO shows 5 maximum amplitudes as the microphone moves. The microphone moves a distance of 2.0 m from the position that gives the first maximum to the position that gives the fifth maximum. What is the wavelength of the sound wave?

1. A0.40 m
2. B0.50 m
3. C0.80 m
4. D1.0 m

As printed in the paper