A Speaker Generates a Continuous Tone of 440 Hz

question 40

Multiple Choice

A speaker generates a continuous tone of 440 Hz. In the drawing, sound travels into a tube that splits into two segments, one longer than the other. The sound waves recombine before being detected by a microphone. The speed of sound in air is 339 m/s. What is the minimum difference in the lengths of the two paths for sound travel if the waves arrive exactly out of phase at the microphone?

• A)0.10 m
• B)0.39 m
• C)0.77 m
• D)1.11 m
• E)1.54 m

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