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Tunning Fork and frequency

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A tuning fork of frequency 550 Hz is placed near the top of the pipe shown in the Figure. The water level is lowered so that the length L slowly increases from an initial value of 20.0 cm. Determine the next two values of L that correspond to resonant modes. (Assume that the speed of sound in air is 343 m/s.)
1 m (shorter length)
2 m (longer length)

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Solution Summary

The solution analyzes a tuning fork frequency. The resonant modes are found.

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In the first resonance position, the length of the air column must be equal to the distance between a Node (N) and an Anti Node(AN). So it is .
But (Lambda) = velocity / frequency. = 343 / ...

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