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A tuning fork produces resonance in the air column above water when the distance between the...

A tuning fork produces resonance in the air column above water when the distance between the free surface of the water and the open end of the tube is 45cm. If the resonance does not occur for any shorter distance, what is the frequency of the tuning fork? The speed of the sound is 331m/s. Note that the diameter of the tube is small compared to 45cm.
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