Asaad, a grade 11 student, completed a lab activity to find the speed of sound in air using a closed-air column. He measured the temperature of the room to be 21 C. Using a tuning fork with a frequency of 1200 Hz, he obtained the following resonant lengths for the closed air col-umn: Observations: L = 7.4 cm L =2 = 22.5 cm = 36.7 cm Questions: a) Use the resonant lengths to do three calculations to find the wavelength. Find the average wavelength and use that in further calculations. b) Using the wave equation, what is the speed of sound in the air column? c) What is the theoretical speed of sound in the room according to the temperature?