Go to http://phet.colorado.edu/simulations/sims.php?sim=Wave_Interference and cl

ID: 1443706 • Letter: G

Question

Go to http://phet.colorado.edu/simulations/sims.php?sim=Wave_Interference and click on Run Now.

Part III: Light Wave Diffraction

Reset the light waves simulation and show the screen and graph.

Add a 2-slit barrier to the simulation and allow the graphs to be formed.

Observe the interference pattern created when the characteristics of the simulation are adjusted.

You may have to adjust amplitude when other elements of the simulation are changed to observe the graph.

1. What effect does a larger amplitude have on the maxima separation in the interference pattern?

2. What effect does a shorter wavelength have on the maxima separation in the interference pattern?

3. What effect does a larger barrier-to-screen distance have on the maxima separation in the interference pattern?

4. What effect does a smaller slit width have on the maxima separation in the interference pattern?

5. What effect does a smaller slit separation have on the maxima separation in the interference pattern?

1.
Larger amplitude will have larger intensity of maxima
It will not effect the maxima separation

2.
y = lambda*D/d
when wavelength is small, separation will be small
Answer: seperation is less

3.
As D increases , y increases
So as distance increases, separation becomes larger

4.
It will just affect the intensity
It will not effect the maxima separation

5
as d increases , y decreases
So as slit width decreases, separation becomes larger

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