# Physics 2025 Lab 1: Sound Purpose

Physics 2025 Lab 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 2025 Lab 1: Sound

### Activity I: The Nature of Sound

Microphone (converts sound to electric voltage) Sound  Pasco 750 Interface Computer/Data Studio : Used as an oscilloscope

Physics 2025 Lab 1: Sound

### Data Studio as a 1-Channel Oscilloscope

adjust vertical axis by clicking on black triangles adjust trigger level here by sliding triangle up or down adjust horizontal axis by clicking on black triangles

Physics 2025 Lab 1: Sound

1ms T (period) 1

ms div f

 1

T

Physics 2025 Lab 1: Sound Activity IV: Measuring the Speed of Sound with an Echo

Microphone 1 (plugged into port

A !!

) Stand Table

d

v

### 2

d t

Hollow cardboard tube

Physics 2025 Lab 1: Sound

Identify a repeated pattern…you may need several attempts t First passage Echo

Physics 2025 Lab 1: Sound Activity 5: Standing Waves and the Speed of Sound

tuning fork

L

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

v s

f

l Note: f is written on the tuning fork .

Physics 2025 Lab 1: Sound

### % Difference (e.g., Problem 8)

%

difference

measured value

theoretica l value

 100

theoretica l value

Physics 2025 Lab 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.