Question

This activity uses PhET simulation - Waves Intro. Select the sound option. This is a guided inquiry task. You must read and follow the instructions carefully. 1 Amplitude of sound waves Tick Play Tone and Particles. Move the Amplitude slider to halfway. Press the green button on the speaker. What happens to the particles? 1. 2. Move the Amplitude slider up and down. How does the sound change? How does the motion of the particles change? Does the position of the pattern change? The pause button and tape might help. Click the Waves button. The Wave setting shows areas where the particles are pushed together as light coloured and where they are far apart as dark. Vary the amplitude and check what you wrote about the position of the pattern. Sound waves are pressure waves in the air. In areas where the particles are compressed the air pressure is high and where the particles are spread out (we call that rarefaction) the pressure is low. The wavelength of a sound wave is the distance between 2 compression areas or 2 rarefaction areas. Use the pause button and tape to measure the wavelength of your soundwave. cm = m You can use the pressure meter tool to keep track of the pressure at a particular place over time. Place one of the detectors into the middle of your box. Use the pause button to see that a high pressure reading matches a bright band and area of compression and that a low pressure reading matches an area of rarefaction. Set the amplitude to zero. This is the where the particles would be if there is no sound. Slowly increase the amplitude and look at the pressure tool.

          This activity uses PhET simulation - Waves Intro. Select the sound option.
This is a guided inquiry task. You must read and follow the instructions carefully.
1 Amplitude of sound waves
Tick Play Tone and Particles. Move the Amplitude slider to halfway.
Press the green button on the speaker.
What happens to the particles?
1.
2.
Move the Amplitude slider up and down. How does the sound change?
How does the motion of the particles change?
Does the position of the pattern change? The pause button and tape might help.
Click the Waves button. The Wave setting shows areas where the particles are
pushed together as light coloured and where they are far apart as dark.
Vary the amplitude and check what you wrote about the position of the pattern.
Sound waves are pressure waves in the air. In areas where the particles are
compressed the air pressure is high and where the particles are spread out (we call
that rarefaction) the pressure is low.
The wavelength of a sound wave is the distance between 2 compression areas or 2
rarefaction areas. Use the pause button and tape to measure the wavelength of
your soundwave.
cm =
m
You can use the pressure meter tool to keep track of the pressure at a particular
place over time. Place one of the detectors into the middle of your box.
Use the pause button to see that a high pressure reading matches a bright band and
area of compression and that a low pressure reading matches an area of rarefaction.
Set the amplitude to zero. This is the where the particles would be if there is no
sound.
Slowly increase the amplitude and look at the pressure tool.

This activity uses PhET simulation - Waves Intro. Select the sound option.
This is a guided inquiry task. You must read and follow the instructions carefully.
1 Amplitude of sound waves
Tick Play Tone and Particles. Move the Amplitude slider to halfway.
Press the green button on the speaker.
What happens to the particles?
1.
2.
Move the Amplitude slider up and down. How does the sound change?
How does the motion of the particles change?
Does the position of the pattern change? The pause button and tape might help.
Click the Waves button. The Wave setting shows areas where the particles are
pushed together as light coloured and where they are far apart as dark.
Vary the amplitude and check what you wrote about the position of the pattern.
Sound waves are pressure waves in the air. In areas where the particles are
compressed the air pressure is high and where the particles are spread out (we call
that rarefaction) the pressure is low.
The wavelength of a sound wave is the distance between 2 compression areas or 2
rarefaction areas. Use the pause button and tape to measure the wavelength of
your soundwave.
cm =
m
You can use the pressure meter tool to keep track of the pressure at a particular
place over time. Place one of the detectors into the middle of your box.
Use the pause button to see that a high pressure reading matches a bright band and
area of compression and that a low pressure reading matches an area of rarefaction.
Set the amplitude to zero. This is the where the particles would be if there is no
sound.
Slowly increase the amplitude and look at the pressure tool.

Added by Luz W.

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