27. The loudspeaker shown is adjusted to cause the pipe to resonate in its fundamental mode. The pipe is open at both ends and the speed of sound in the air inside the pipe is 340 m/s. Find the frequency of the sound generated in the pipe. Answers in Hz. 

(A) 1000
(B) 500
(C) 250
(D) 25

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統計： A(1), B(4), C(0), D(2), E(0) #874930