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**Calculate Resonance Wavelength??**

## Homework Statement

Ive been asked to calculate the resonance wavelength of gas in a resonance tube.

What I have to calculate this with is the frequency f and the average difference of length between each 1⁄2 wavelength measurement. It says calculate it using these 2 things and I cant find a formula to do this with.

## Homework Equations

## The Attempt at a Solution

I know a normal wavelength is v/f but I dont know how to calculate this using the difference between 1/2 wavelength measurements.