1. The problem statement, all variables and given/known data A 15.7cm long, closed-end tube, filled with air, resonates when exposed to sound waves with a frequency of 550hz. Calculate the speed of sound. 2. Relevant equations V=331.4 + 0.6*Temp.C V=wavelength*frequency V=d/t 3. The attempt at a solution I'm thinking I need to use V=331.4 + 0.6*Temp.C to find the velocity, though temperature is not given I think my teacher told me you can assume it is 20 degrees C if temperature is not given. Is that right? However, that doesn't explain why they gave you the length, so maybe thats not the equation I should even use.