Multiple Choice
The sound from a single source can reach point O by two different paths.One path is 
long and the second path is 21.0 m long.The sound destructively interferes at point O.What is the minimum frequency of the source if the speed of sound is 340 m/s?
A) 340 Hz
B) 6800 Hz
C) 520 Hz
D) 680 Hz
E) 170 Hz
Correct Answer:
Verified
Correct Answer:
Verified
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