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Physics 2225 Minilab 1: Sound
Purpose
• Visualize the wavelike nature of sound by using a sound-to-voltage transducer (otherwise known as a microphone….).
• Measure the speed of sound in a variety of ways.
Physics 2225 Minilab 1: Sound
Activity I: The Nature of Sound
Sound
Microphone (converts sound to electric voltage)
Pasco 750 Interface
Computer/Data Studio : Used as an oscilloscope
Physics 2225 Minilab 1: Sound
Data Studio as a 1-Channel Oscilloscope
adjust horizontal axis by clicking on black triangles
adjust vertical axis by clicking on black triangles
adjust trigger level here by sliding triangleup or down
Physics 2225 Minilab 1: Sound
T (period)
Tf
1
divms11ms
Physics 2225 Minilab 1: Sound
Activity IV: Measuring the Speed of Sound with an Echo
Table
Stand
Microphone 1 (plugged into port A !!)
Clap !
dt
dv
2
time
distance
Hollow cardboard tube
Physics 2225 Minilab 1: Sound
First passage
Echo
Identify a repeated pattern…you may need several attempts
t
Physics 2225 Minilab 1: Sound
Activity 5: Standing Waves and the Speed of Sound
tuning fork
Procedure: Adjust pipe location until the sound from the
tuning fork is amplified. Measure L as shown on the left. Think about the relationship between the
wavelength l and the length L. Determine wavelength .l Calculate the speed of sound using
L
fvs
Note: f is written on the tuning fork.
Physics 2225 Minilab 1: Sound
% Difference (e.g., Problem 8)
100%
valueltheoretica
valueltheoreticavaluemeasureddifference
Physics 2225 Minilab 1: Sound
Important
We will need to use “Data Studio” instead of “Capstone” in this activity. The file cannot be loaded from the website. You need to go to the desktop of your computer and find the shortcut “Physics Lab”. Then click your way through the folders to the Data Studio activity called “Sound”.
Whenever you launch a new Data Studio file, you must first close all other existing Data Studio files and all Capstone activities. Then launch the new Data Studio Activity. Still, sometimes the “Start Button” won’t work. If that happens, close the file and launch it again.
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