practiceexam8 - City College, Chemistry Department...

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City College, Chemistry Department Chemistry 10301, sections L and L2, Prof. T. Lazaridis Third Midterm exam, Dec 4, 2001 Name (last name first): ___________________________________ I.D. Number: ____________________________________________ Workshop leader:________________________________________ Note: There are 7 questions in this exam. Fill in your answer in the blank space provided immediately following each question. One point will be subtracted every time you report a numerical result with an incorrect number of significant figures. Useful data: Speed of light : 2.9979 X 10 8 m/s Planck's constant : 6.626 X 10 -34 Js E n = -2.179 X 10 -18 J/n 2 1. The electron in a hydrogen atom drops from the excited state with n=3 to the ground state, emitting a photon. a. (5) What is the energy of this photon? Δ E = -2.179 X 10 -18 J X ( 1 1 2 - 1 3 2 ) = -1.937 X 10 -18 J b. (5) What is the wavelength of this photon? Δ
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practiceexam8 - City College, Chemistry Department...

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