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Pipe A is open at both ends and has length LA. Pipe B is closed at...

Pipe A is open at both ends and has length LA. Pipe B is closed at one end and open at the other and has length LB. When both pipes produce sound in their second overtones, the result is a beat frequency of 2.5 Hz.   
a. Make a careful sketch of the standing wave pattern for the air displacement for each pipe. Next to each sketch write the wavelength for each pipe in terms of the pipe lengths LA and LB.

b. Write the frequencies of the sound in each pipe in terms of the speed of sound v and the pipe lengths. c. Find the length of pipe B if pipe A has length 0.75 m and the speed of sound v = 344 m/s, and if we notice that the frequency fB is greater than fA.

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Answer #1

LA 2 (015) elem 4Lp s v 4(690 S

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