Green River Community College Wave Interference Physics Lab Report

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Green River Community College

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Lab 9: Wave Interference INTRODUCTION Consider the four pictures shown below, showing pure yellow lights shining toward a screen. In 3 and 4, there is a solid wall between the light and screen, with one or two slits cut in to let the light through. Compare the four scenarios. We are interested in your ideas about what is going on – you will only be graded for effort here. What do you think might be happening to the light to create these different patterns? Discuss with your group and write your ideas in the space below. University of Colorado at Boulder, Department of Physics Part 1. Wave Interference Simulation Open the PhET simulation “Wave Interference.” Explore the simulation to get a feel for the controls. https://phet.colorado.edu/en/simulation/wave-interference a. Try to recreate the pictures shown on page 1 with the simulation. Describe what you had to do with the simulation to reproduce the pictures. b. Compare what you learned from the simulation to your ideas from page 1. What ideas would you keep? What ideas would you change? (Did you notice the third bright spot right behind the wall in case 4?) c. What happens to the pattern on the screen when the lights are brought closer to each other or farther apart? d. What happens to the pattern when the slits are brought closer and farther apart? University of Colorado at Boulder, Department of Physics Interference from two slits: 1 2 3 The pictures above show two ways of representing light waves from two slits. Three points are marked 1, 2, and 3 in the picture on the right. e. Predict the brightness of the light you would see on a screen places at points 1, 2, and 3. f. Describe how you might use a picture like the one on the left to support your prediction and explain what is happening at points 1, 2, and 3 on the right. We are interested in your ideas. Write down all the ideas you can think of. You can use the simulation to help you. University of Colorado at Boulder, Department of Physics Part 2. Double Slit Interference In the pictures on the last page, the rays are emitted in all directions from the slits, but let’s concentrate on the rays that are emitted in a direction  toward a distant screen ( measured from the normal to the barrier). One of these rays has further to travel to reach the screen, and the path difference is given by d sin  . a. Predict the brightness on the distant screen if the path difference is exactly one wavelength  (or any integer number of wavelengths)? Explain your reasoning. b. Predict the brightness if the path difference is /2, 3/2, or 5/2, etc.? Which equation below tells you the angles () at which you will see bright spots and which one tells you the angles () for dark spots? d sin  = m   m = 0,  1,  2.. Circle one: Bright or Dark d sin  = (m + 12 ).  c. What ideas from part 1e (page 3) would you keep and which would you revise? Circle one: Bright or Dark d. How do the equations above support your predictions of brightness and the pattern shown on the right? University of Colorado at Boulder, Department of Physics Small angle simplification: If  is small (
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Lab 9: Wave Interference

INTRODUCTION
Consider the four pictures shown below, showing pure yellow lights shining toward a
screen. In 3 and 4, there is a solid wall between the light and screen, with one or two
slits cut in to let the light through.
Compare the four scenarios. We are interested in your ideas about what is going on –
you will only be graded for effort here. What do you think might be happening to the light
to create these different patterns? Discuss with your group and write your ideas in the
space below.

In scenario 1, there is only source and no barrier. Light will be shone directly to the
screen.
In scenario 2 there are two sources, the waves in interact with each other forming bright
bands and alternative dark banks indicating constructive and destructive interference
respectively.
in Scenario 3, the slit experiment it is the example of diffraction of light as it...


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