RecitationSet5_AnsKey

RecitationSet5_AnsKey - Tufts University - Chem 1 - Summer...

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Tufts University - Chem 1 - Summer 2008 Recitation Set 5 Answer Key 1 . If a metal is irradiated with the 327 nm UV light, electrons having a de Broglie wavelength of 1.85 nm are emitted. Calculate the work function of the metal in J. De Broglie wavelength: λ e = h/(m e v e ) Photoeffect formula: h ν = Φ + ½ m e v e 2 Mass of an electron: m e = 9.11×10 -31 kg
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2 . Two 1 H atoms in ground states move towards each other with the speeds of 6.25×10 4 m/s each. Upon collision, they break into two protons that move with negligibly small speeds, and two fast electrons moving at equal speeds. Calculate the speed of the electrons. Energy of an electron in a hydrogen atom: E = (-R H ”/n 2 ) , where R H = 2.18×10 -18 J Mass of an electron: m e = 9.11×10 -31 kg Mass of a 1 H atom: m H = 1.67×10 -27 kg
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3 . [6.40] The hydrogen atom can absorb light of wavelength 2626 nm. (a) In what region of the electromagnetic spectrum is this absorption found? (b) Determine the initial and final values of n associated with this absorption.
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This note was uploaded on 06/13/2008 for the course CHEM 1 taught by Professor Kryatov during the Spring '08 term at Tufts.

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RecitationSet5_AnsKey - Tufts University - Chem 1 - Summer...

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