Frequency of tuning fork in Hz 

First position of resonance length, l_{1} in cm 
Second position of resonance length, l_{2} in cm 
Third position of resonance length, l_{3} in cm 
Wavelength in cm calculated from 2(l_{2}  l_{1}), 2(l_{3}  l_{2}) and l_{3}  l_{1}, using average values of the resonance lengths 
Velocity of sound in air in m/s calculated from wavelength in meters x frequency in Hz 