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 $330m{s^{ - 1}}$.
What is the lowest frequency of sound that could create a stationary wave in the corridor with a node halfway along it?
1 )
0.040 Hz
2 )
13 Hz
25 Hz
4 )
50 Hz
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