A Speaker Generates a Continuous Tone of 440 Hz

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