Lab 12 Resonance Lab

Lab 12 Resonance © 2020 Lone Star College. All Rights Reserved. Compute the theoretical tube lengths required for the first, third, fifth, and seventh harmonics (n= 1, 3, 5 and 7) at each of the two frequencies. (These lengths will give you approximate points where you should get resonance) Record these theoretical values in Table 1. 2. Fill the resonance tube with water. Practice varying the height of the tube by moving the water tube up and down. The water level in the tube will rise when the tub is above the water line, and it will fall when the tube is below the water line. 3. Using the rubber mallet, hit the tuning fork. With the tuning fork oscillating, hold it so that the side of the tuning fork is directly over the top of the tube. Note: - Do not hit the tuning fork with anything other than the rubber mallet. - Hold the tuning fork as close to the opening of the tube as possible, but do not touch the tube. 4. Vary the length of the tube until you hear a standing wave amplification of the tuning fork for the first harmonic. Use your previously calculated theoretical values of tube length to help you find the approximate location of the water level. Record the actual/experimental length of the tube in Table 1 below. 5. Since this is an online lab, watch “Resonance - Data Collection Video: and record the actual lengths of the tube corresponding to 4 harmonics for each tuning fork and record the data in Table 1 below. 6. Compare the Theoretical values with experimental value of the length of tubes. TABLE 1 - Experimental Length of Resonance Tubes: 14 points 1s t Harmonic 3rd Harmonic 5 th Harmonic 7 th Harmonic Exper. Theor Exp Theor Exp Theor Exp Theor Exp 1024 Hz 0.084 m 0.083 0.252 m .25 m 0.421 m .423 m 0.589 m .6 m 2048 Hz 0.042 m .04 m 0.126 m .12 m 0.842 m .21 m 0.294 m .23 m 2