ON21 P12 Q24 Loudspeaker Intensity and Minima | Oct/Nov 2021 | Cambridge A Level 9702 Physics

9702/12/O/N/21: A sound wave from a loudspeaker is reflected back along its original path by a reflector. A microphone is initially at point X where the sound intensity is a minimum, as shown. The microphone is moved towards the reflector and passes through four more intensity minima until reaching a fifth minimum at point Y. The distance XY is 70.0 cm. What is the wavelength of the sound?
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