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Wave Interference

Phet:  Wave Interference- Waves (Sound and Light)

Go to the Phet website and under Physics- Sound and Waves, click on https://phet.colorado.edu/sims/html/wave-interference/latest/wave-interference_en.html the Waves simulation. Type Answers in BLUE

Click on the green button and turn on the liquid dropping into a container filled with liquid (top view).

  1. What does the dropping liquid create?

The liquid is making an increase in waves

  1. Describe what you see as liquid continues to drop?

I begin to see waves as the drops of the liquid drop.

  1. 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? As it decreases amplitude the liquid stops dripping from the faucet. As it increases amplitude it drips at a normal speed.
  2. What is amplitude?

The maximum extent of a vibration or oscillation, measured from the position of equilibrium.

  1. Increase and decrease the frequency setting. What happens to the actual drops of liquid AND the waves as you increase and decrease frequency?
  2. What is frequency?

Frequency is the number of occurrences of a repeating event per unit of time

Attach the wave meter. 

  1. Using and viewing the wave meter. Increase and decrease amplitude, what happens to the waves on the meter?  They increase and decrease because of the amplitude.
  2. Using and viewing the wave meter. Increase and decrease frequency, what happens to the waves on the meter? They increase and decrease speed.

Use the pulse option (bottom left of screen, click on the one wave) AND change the view of the water to a side view. 

  1. 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. If Frequency and amplitude are max they are fast and short. If they are at zero

Reset the simulation.  Click on the sound speaker and attach your wave meter.  Click on “both” so you can view the waves and particles.

  1. 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?

Reset the simulation.  Click on the light tool and attach your wave meter.  Also, click on “screen.”

  1. Explore the light simulation for several minutes. Be sure to change the colors.  What do you notice about changing the colors?
  2. View the colors again and pay attention to their wavelengths. Compare and contrast the wavelengths in red light, green light, and violet light.
  3. Why does the screen turn the color of the light being emitted?

Reset the simulation and go back to the sound speaker.  Click on “graph” and explore the simulation.

  1. What is being graphed with sound waves (look at the labels on the x and y-axis)?
  2. 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?

Reset the simulation and go back to the light tool.  Click on the “graph” and explore the simulation.

  1. What is being graphed with light waves (look at the labels on the x and y-axis)?
  2. 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?

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