Part I: Measuring Frequency A.Connect the microphone to the LabQuest and computer. B.Obtain a tuning fork and record the accepted frequency stamped on.

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Presentation transcript:

Part I: Measuring Frequency A.Connect the microphone to the LabQuest and computer. B.Obtain a tuning fork and record the accepted frequency stamped on the fork. C. Strike the fork with the mallet and place it near the microphone. Record the sound wave and measure the time T between adjacent peaks. D.Calculate the experimental frequency: f exp = 1/T E.Calculate the percent error between the accepted frequency and the experimental frequency.

Data Table TrialT(s)f exp f accepted % Error

PART II: Speed of Sound A.Connect the microphone to the LabQuest and computer. B.Open the Vernier experiment file” Speed of Sound”. Obtain a hollow tube closed at one end. C. Place the microphone at the open end and snap your fingers after collect is pressed. Obtain a graph of the sound and its reflection. E.Read the time  t it take for the sound to travel down and back the tube from the graph. (See the next slide.) Also, measure and record the length of the tube. F.Calculate the experimental speed of sound v exp = 2L/  t G.Measure the room temperature in Celsius. H.Calculate the accepted speed of sound v accepted = T C I.Repeat for 4 more trials and find the percent error for each trial.

Example Graph

Data Table Speed of Sound Trial ttTube Length L (m) v calculated =2L/  t v accepted = T c % Error Temperature T c = _____________

Questions 1.If you tune you guitar inside and then take it outside where it sits in colder air, do the strings go sharp or flat? Hint: do the strings get a little longer or shorter as they cool? 2.Why do you think the speed of sound increases as the air gets warmer? 3.In part I, did you see any evidence that the tuning fork put out more than one frequency? Explain.

Report Checklist A.Both Data Tables B.Sample Calculations C.Two Questions D.Summary A.Both Data Tables B.Sample Calculations C.Two Questions D.Summary