FM22 P12 Q25 Stationary Wave in Corridor | May/June 2022 | Cambridge A Level 9702 Physics

9702/22/F/M/12: A corridor is 13.2 m long and has closed doors that reflect sound at both ends. The speed of sound in the air in the corridor is 330 m/s. What is the lowest frequency of sound that could create a stationary wave in the corridor with a node halfway along it?
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