M easurement continuing your exploration sketch the

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M EASUREMENT Continuing your exploration, sketch the interference patterns for two pairs of slits with the same slit widths and different slit separations. 180
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INTERFERENCE DUE TO A DOUBLE SLIT – 1202Lab7Prob1 Place a sheet of paper on the screen as a recording device. On the paper, label positions of the maxima you can observe. Be sure to record the distance from the slits to the screen. Repeat this operation, for the two pairs of slits, for at least two different distances between the screen and the slits. (Be sure to record the distance from the slits to the screen each time, and the widths and separations of the slits reported on the slide.) Measure the positions of the interference maxima for each trial. A NALYSIS Compare the sketches you prepared during measurement to the graphs from your warm-up questions answers. Do the patterns match? Use your measurements from each trial and your predicted relationships to determine the wavelength of the laser light. Do you obtain a consistent value across different trials? If so, is it comparable to the accepted value for the wavelength of light produced by a Helium Neon laser? C ONCLUSION Can you tell which features of a two-slit interference pattern are caused by light from one slit interfering with light from the other slit? Can you distinguish them from the features due to light from part of one slit interfering with light from another part of the same slit? Explain. Do your results allow you to rule out the possibility of determining the size of a single virus from the pattern due to several copies of the same virus in close proximity to one another? Explain. The size of common viruses is on the order of 10 -6 m to 10 -8 m. When determining virus size with an interference technique, would it be helpful to use light with a different wavelength from the one you used for this problem? If so, explain why. 181
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