Resonance Mini-Lab Name______________________ date_______ Physics – Frisby Purpose: Determine the frequency of a “mystery” tuning fork Materials: - graduated cylinder with water - ruler - PVC pipe - tuning fork of unknown frequency - thermometer Procedure: 1. Write a numbered list of steps you will take in order to complete your experiment. 2. Draw a sketch of displacement of air in the shortest closed pipe (one end closed) that produces a standing wave (intensifies the sound of the tuning fork). 3. Calculate the speed of sound using the relationship: v = 331m/s + 0.6 t, where t is the air temperature in degrees Celsius. 4. When you calculate and record the frequency of your tuning fork, your teacher will remove the masking tape from the fork. Calculate the %-error for the experimental frequency of your tuning fork. The formula for % error is: f – fexp = ----------- 100% f 5. Give a reason for your percent error. Data: Record your data in a data table: Temperature v L fexp f ε (˚C) (m/s) (m) (Hz) (Hz) 6. What is the next length where resonance will occur for your tuning fork? Calculate the length of the air column and draw a sketch of displacement of air for this case. 7. Explain the relationship between the size of organ pipes and their resonant frequencies.
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