Physics 2225 Minilab 1: Sound Purpose Visualize the wavelike nature of sound by using a sound-to-voltage transducer (otherwise known as a microphone….).

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.