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.

Sound

Activity I: The Nature of Sound

Sound

Microphone (converts sound to electric voltage)

Pasco 750 Interface

Computer/Capstone : Used as an oscilloscope

Sound

Using Capstone for Sound Lab

Click/Read through the first 4 tabs for some useful instructions

Sound

T (period)

Tf

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

Sound

First passage Echo

Identify a repeated pattern…you may need several attempts

t

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.

Sound

% Difference (e.g., Problem 8)

100%

valueltheoretica

valueltheoreticavaluemeasureddifference