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Unformatted text preview: Duke University Department of Physics Physics 143 Fall Term 2007 PRACTICE QUIZ 2 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: Consider a helium atom which has had one of its electrons stripped. What formula will describe the frequencies of the spectral lines for this He + atom? Find an expression for the energy required to remove the remaining electron in its ground state. Problem 2: A 1.00 g marble is constrained to roll inside a tube of length L = 1 . 00 cm. Modeling this as a 1D infinite square well, find the value of the quantum number n if the marble is initially given an energy of 1.00 mJ....
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 Fall '07
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