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Two whistles which behave like pipes with one closed end and one open end are blown and a beat frequency of 16.63 Hz is

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Two whistles which behave like pipes with one closed end and one open end are blown and a beat frequency of 16.63 Hz is heard between the fundamental frequencies of the two whistles. If the shorter whistle is 7.40 cm long, how long is the other (in cm)? You may assume the speed of sound in air to be 345 m/s.

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