UMass Amherst PHYSICS 132  Lab 2 In Class Assignment (2 pages)
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Lab 2 In Class Assignment
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 University of Massachusetts Amherst
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 Physics 132  Intro Physics II
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Atreyi Saha Physics 132 Section LL Mondays 8 00 AM Hasbrouck 212 February 8 2016 In Class Questions Wave Nature of Light 1 Calculate the slit width of a single slit by analyzing the diffraction pattern List possible sources of error in your answer lambda a w 2L 6 33 10 7 a 0 0173 a 3 66 10 5 m or 0 0366 mm Because lambda is a known value since the lambda associated with a Helium Neon laser is 633 nm the possible sources of error in this calculation come from errors in measuring w or L For example to measure w we must measure from the center of one dark spot to the center of another dark spot Errors in measuring this value by using the edge of the dark spots to calculate can skew the calculated value for a 2 Wavelength calculation for double slit and diffraction grating a Use the interference pattern from the double slit to calculate the wavelength of the laser Compare this with the given value Repeat the wavelength calculation using diffraction grating Given lambda 633 nm Double slit calculations theta y L 0 001 m 0 52 m 0 001923 d sin theta m lambda d sin theta m lambda 0 00025 0 001923 1 481 nm Diffraction Grating sin theta 0 04 sqrt 4 0 082 0 0652 sin theta 0 29 d sin theta m lambda lambda 5 5 10 7 m 550 nm b Discuss the differences in the pattern on the screen when using the grating and a double slit Which one makes more accurate measurement and why The difference between the double slit and diffraction grating is 70 nm The diffraction grating makes a more accurate measurement with a value of 550 nm which is very close to the established value of 633 nm While the location of the bright spots was the same diffraction grating enabled the location of the spots to be much more well defined therefore leading to more accurate measurements of Y This is why the lambda value for diffraction grating was closer to the established value
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