Fall 07 Phys 143l Practice Exam 1

# Fall 07 Phys 143l Practice Exam 1 - Duke University...

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Duke University Department of Physics Physics 143 Fall Term 2007 PRACTICE QUIZ 1 I will abide by the Duke Community Standard. Name: This is a closed book exam, with one side of one page cheat sheet allowed. Calculators are allowed, but only for basic calculations: you may not use special memory, graphing etc. functions. You must always show your work for credit. Each problem is worth 10 points. You must hand in your cheat sheet with your test. Problem 1: Red light from a laser ( λ = 632.8 nm) is incident on a screen containing two very narrow horizontal slits separated by 0.200 mm. A fringe pattern appears on a white piece of paper held 1.00 m away. a. Approximately how far, in mm, above and below the central axis are the first dark stripes? b. How far from the central axis is the 5th bright band? c. Describe/sketch qualitatively what happens to the pattern if more equally-spaced slits are added to the screen. Problem 2: How fast must a meter stick be moving if its length is observed to shrink to 0.5 m?

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