The Sound from a Single Source Can Reach Point O

question 54

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

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