4. PHET waves intro
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University of Texas, El Paso *
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3304
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Astronomy
Date
Dec 6, 2023
Type
docx
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3
Uploaded by edithparra14
Name: Edith M Parra PHET waves intro
https://phet.colorado.edu/en/simulation/waves-intro
Click on the above link. Start simulation. Choose Water
Click Side View, (bottom left) Choose the multi wave.
Set Frequency and Amplitude in the middle. Click the Graph.
Click on the green dot on the faucet and start the water flowing. Observe the waves. Compare what you see with the water to the waves on the graphs.
1.
Now increase the frequency. What happens with the number of waves?
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The number of the waves increases. What happens to the distance between waves (wavelength)?
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The wavelength decreases
2.
Increase the amplitude. What happens with waves?
-
The waves get taller 3.
Decrease the frequency, What happens with the number of waves?
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The number of waves decreases What happens to the distance between waves (wavelength)?
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The wavelength increases 4.
Decrease the Amplitude, What happens with the waves?
-
The waves stop forming/get shorter Now choose the Speaker (sound) the bottom. Set to side view and the multiple waves. Put Frequency and Amplitude in the middle (just like you did with the water) Choose Play Tone and Waves.
5.
You can have your sound on - but don’t have it extremely loud. Push the green button for sound. What do you notice about the waves?
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The waves all have the same distance between each other 6.
What do you notice about the speaker?
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The speaker pulses in and out 7.
Now
increase the frequency. How does the speaker movement change?
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The speaker pulses faster 8.
What happens with the pitch of the sound? It gets higher the number of waves? Increases What happens to the distance between waves (wavelength)? It increases
9.
Now decrease the frequency. How does the speaker movement change?
-
The speaker pulses slower 10. What happens with the pitch of the sound? It gets lower the number of waves? They decrease
What happens to the distance between waves (wavelength)? It increases 11.
Increase
the amplitude. How does the speaker movement change?
-
The speaker pulses further in and out
12. Does the pitch change? The pitch stays the same What happens to the volume? Volume increases 13.
Decrease the amplitude. How does the speaker movement change?
-
The speakers stops moving or moves slower 14. Does the pitch change? Yes What happens to the volume? The volume decreases
Turn off the Tone. Click on BOTH (for particles and waves) Move the Frequency and Amplitude sliders side to side (high to low) Watch the particles, especially the red dots. 15. Describe how the particles move wave energy.
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The particles move to stay in the same area Now choose Light at the bottom. Set the Frequency and Amplitude sliders in the middle.
16. What color is the light?
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The light is green 17. Slide the frequency to the left (so a lower frequency). What happens to the color?
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The color is going to change to red What happens to the number of waves?
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The number of waves is going to decrease
What happens to the distance between the waves (wavelength)?
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The wavelength increases 18. Slide the frequency to the right (so a Higher frequency). What happens to the color?
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The color turns blue/purple
What happens to the number of waves? The number of waves increases What happens to the distance between the waves (wavelength)? The wavelength decreases
19. Choose one color (frequency). Increase the Amplitude
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BLUE
Does the color (frequency) change?
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Yes Does the Brightness change? How?
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Yes, because the waves turn into a brighter blue 20. Choose one color (frequency). Decrease the Amplitude
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Blue Does the color (frequency) change?
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Yes Does the Brightness change? How
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Yes, the waves will become a more opaque blue SUMMARY: Describe what you see (or hear) for each situation (the first column is filled in for you)
High Amplitude
Low Amplitude
High Frequency
Low Frequency
Short
Wavelength
Long
Wavelength
Water
Tall waves
No
Decreased wavelength Increased wavelength Slower waves
Faster waves
Sound
Loud Sound
No Decreases wavelength and sound loud Increased wavelength and soft sound Slow waves and loud sound Fast waves and soft sound
Light
Bright Light
No Blue purple light Orange red light Slow waves, and orange red light Fast waves, and blue purple light
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