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Suppose we have a tube with adjustable length and open at both ends. The wavelength of...

Suppose we have a tube with adjustable length and open at both ends. The wavelength of the fundamental mode of vibration is lambda for a given length. Suppose now that the tube is adjusted to twice the given length. What happens to the wavelength of the fundamental mode?

A. It is halved.
B. It is doubles.
C. It quadruples.
D. Can’t tell without knowing the velocity of sound in air
E. Can’t tell without knowing the frequency of vibration
F. Both D and E
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