The experiment, using a resonance tube set–up, was carried out in a room at a temperature θ°C . The tuning fork used had a frequency N(Hz) and the first and second positions of resonance were observed for lengths l1 (cm) and l2 (cm), respectively, of the air–column. From these observations, one can say that the velocity of sound, in air, at 0°C, equals
(1) \(\frac{N(l_2-l_1)}{50}(1+\frac{\theta}{273})^{1/2} (m/s)\)
(2) \(\frac{N(l_2-l_1)}{50}(1+\frac{\theta}{273})^{-1/2} (m/s)\)
(3) \(\frac{N(l_2-l_1)}{50}(1-\frac{\theta}{273})^{-1/2} (m/s)\)
(4) \(\frac{N(l_2+l_1)}{50}(1+\frac{\theta}{273})^{-1/2} (m/s)\)