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Statement of a problem № 3539

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An open organ pipe sounding its fundamental note is in tune with a fork of frequency 439 cycles/s. How much must the pipe be shortened or lengthened in order that 2 beats/s shall be heard when it sounded with the fork? Assume the speed of sound is 342 m/s.

Solution:
An open organ pipe sounding its fundamental note is in tune with a fork of frequ

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