Q. A hollow metallic tube closed at one end produces resonance with a tuning fork of frequency n at temperature T. The temperature of the tube is increased by dT. If the coefficient of thermal expansion of the tube metal is alpha, the beat frequency will be - (there are 4 option in the attached image)
Frequency for a tube closed at one end - n=v/(4l),3v/(4l)....
The Attempt at a Solution
I have no idea ho to get the solution in terms of temperature and coefficient of thermal expansion.
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