UMass Amherst PHYSICS 132  Phy 132 Lab 4 Thickness of Hair (4 pages)
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Phy 132 Lab 4 Thickness of Hair
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 University of Massachusetts Amherst
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 Physics 132  Intro Physics II
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Physics 132 Lab Lab 4 Thickness of Hair Experimental Design 1 What is the null hypothesis for this lab What is your alternative hypothesis A null hypothesis would be there is no significant difference between measuring with a caliper or using diffraction An alternative hypothesis is there is a significant difference in measuring with a caliper rather than measuring using diffraction 2 Which set of measurements do you think will be better How will you define a set of measurement being better than the other A set of measurements is better than another set when it is both more accurate referring to the closeness of a measured value to a standard or known value and more precise referring to the closeness of two or more measurements to each other I think the better measurement will be diffraction because it s more technical and should render more precise measurements Measuring with the Caliper 3 4 Measure the thickness of the hair using the calipers measuring to the nearest 0 01 mm Get a measurement from everyone at your table for a total of four measurements Don t share your measurements until after everyone has done one it s important that your measurements don t influence one another Name Measurement mm John 0 09 Mateo 0 05 Vikki 0 03 Darren 0 06 Calculate the mean and standard deviation of these measurements this will be one of your sets of data for this lab 0 025 is the standard deviation 0 0575 mm is the mean Measuring with Diffraction With this experiment we will be using a strand of hair to create a double slit to generate interference of light Let s take a closer look at what s going on The difference between the physical path lengths for a double slit is There is a slight difference for our situation With the hair what we have is a double slit with the slits being really infinitely wide When this fact is taken into account using calculus we get a factor of two popping up underneath the d so we have 5 Create an equation for in terms of the distance between the
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