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19. A closed-end tube resonates at a fundamental frequency of 440.0 Hz. The air in the tube
is at a temperature of 20°C, and it conducts sound at a speed of 343 m/s.
(a) What is the length of the tube?
(b) What is the next higher harmonic frequency?
(c) Answer the questions posed in (a) and (b) assuming that the tube were open at its
far end.

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