A 400 Cm Long Organ Pipe Is Filled with Air at at 0

A 40.0 cm long organ pipe is filled with air at 0 $^{\circ}$ C and is open at both ends.The velocity of sound in air at 0 $^{\circ}$ C is 331 m/s.Another 40.0 cm long organ pipe is filled with air at 20 $^{\circ}$ C and is open at both ends.What is the beat frequency between the fundamental modes of the two organ pipes?

A) 20.5 Hz
B) 17.5 Hz
C) 15.6 Hz
D) 14.9 Hz
E) 12.3 Hz

Correct Answer:

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