Phet Waves Intro Water Sound Light (1)

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Savannah Technical College *

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Physics

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Feb 20, 2024

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Phet: Waves Intro- Water, Sound and Light Go to the Phet website and under Physics, click on Waves Intro and choose the Water simulation. Click on the green button and turn on the liquid water dropping into a container filled with liquid water (top view). 1. What does the dropping liquid create?  The liquid creates waves from the falling liquid. 2. Describe what you see as the liquid continues to drop?  Waves formed moving outward. 3. Increase and decrease the amplitude setting. What happens to the actual drops of liquid AND the waves created as you increase and decrease the amplitude?  The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. 4. What is amplitude?  vertical distance between a peak or a valley 5. Increase and decrease the frequency setting. What happens to the actual drops of liquid AND the waves as you increase and decrease frequency?  The higher the frequency, the faster the water drops and the more frequent there are waves. 6. What is frequency?  The number of waves passing in a certain amount of time. Attach the wave meter.

7. Using and viewing the wave meter. Increase and decrease amplitude, what happens to the waves on the meter? Draw what you see. 8. Using and viewing the wave meter. Increase and decrease frequency, what happens to the waves on the meter? Draw what you see. Use the pulse option (bottom left of screen, click on the one wave) AND change the view of the water to a side view. 9. You will have to press the green button each time to generate a wave. Manipulate the amplitude and frequency for a few minutes and describe your experience.  When the frequency is low it feels like the wave is in slow motion and when it is high it seems to be fast.  When the amplitude is low the wave can almost be non-existent and when it is high it seems to be very deep. Go back to Waves Intro and click on Sound, be sure to also attach your wave meter. Click on “both” so you can view the waves and particles.

10. Explore the sound simulation for several minutes. Be sure to manipulate the amplitude and frequency. Describe your experience and be sure to describe what you notice about the particles?  When the amplitude is high the particles move fast and when it is low the particles are almost still. When the frequency is low the particles move back and forth in a slow motion while when the frequency is high, they move back and forth fast. Go back to Waves Intro and click on Light, be sure to also attach your wave meter. Also, click on “screen.” 11. Explore the light simulation for several minutes. Be sure to change the colors. What do you notice about changing colors?  Different colors have different wavelengths. 12. View the colors again and pay attention to their wavelengths. Compare and contrast the wavelengths in red light, green light, and violet light.  The red light is the slowest and most spread out and then the green is faster and not as spread out. The violet one, however, is the fastest and isn't really spread out much. 13. Why does the screen turn the color of the light being emitted?  As the frequency of the wave increases, the color changes. It goes through the color spectrum. Go back to Waves Intro and Sound. Click on “graph” and explore the simulation. 14. What is being graphed with sound waves (look at the labels on the x and y-axis)?  pressure and position 15. Compare the waves at the start of the graph to the end of the graph. What happens to the waves on the graph over time?  The waves at the beginning move up and down a lot and they start to flatten out at the end of the graph.

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Go back to Waves Intro and Light. Click on the “graph” and explore the simulation. 16. What is being graphed with light waves (look at the labels on the x and y-axis)?  electric field and position 17. Compare the waves at the start of the graph to the end of the graph. What happens to the waves on the graph over time?  They start big and get smaller over time.

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