Physics Speed of Sound Lab Report

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  • Topic: Resonance, Resonator, Sound
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Samantha Mackey
13. 2nd hour

PHYSICS LAB REPORT: SPEED OF SOUND

Purpose:

In this lab, we will be doing 3 major things: 1) Collecting and organizing data to obtain resonant points in a closed pipe, 2) measure the length of a closed-pipe resonator, and 3) analyze the data to determine the speed of sound.

Procedure:

1. Fill the graduated cylinder nearly to the top with water, with a tall glass tube open at both ends (the water level with act as the closed end). 2. Determine the room’s air temperature, and also measure the diameter of the glass tube. Record the data. 3. Select a tuning fork and record the frequency (in Hz) in the data table. Record the data. 4. Strike the tuning fork against a rubber stopper, and hold it just above the opening of the glass tube. Raise or lower the glass tube/fork until the loudest sound is heard. 5. Once you hear the loudest resonation, hold the tube in place. Measure the distance from the water level, to the top of the glass tube. Record the data. 6. Repeat Steps 3-5.

Calculations/Analyze (Taken from Trial #1):

1. Accepted Speed of Sound = 331 m/s + 0.6(Temperature)
v = 331 + 0.6(22) = 344.2 m/s

2. Wavelength = 4 x Length of Tube above Water
λ = 4 x (0.32) = 1.28 m

3. Experimental Speed of Sound = Frequency x Wavelength
v = 256 x 1.28 = 327.68 m/s

4. Accepted Value – Experimental Value x 100 = Percentage Error
Accepted Value

344.2 – 327.68 x 100 = 4.9 %
344.2

5. Corrected Wavelength = 4(L + 0.4d)
λ = 4(0.32 + 0.4(0.031)) = 1.3296 m

6. Corrected Speed of Sound = Frequency x Wavelength
v = 256 x 1.3296 = 340.38 m/s

7. Accepted Value – Experimental Value x 100 = Percentage Error
Accepted Value

344.2 – 340.38 x 100 = 1.11 %
344.2
Data: Accepted Speed of Sound = 344.2 m/s Temperature = 22° C Trial |Tuning Fork Frequency (Hz) |Length of Tube (m) |Wavelength (m) |Speed of Sound...
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