# Homework 3 ANSWERS.docx - CHM 114 GENERAL CHEMISTRY I FALL...

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CHM 114 GENERAL CHEMISTRY I FALL 2018 TAKE HOME ASSIGNMENT #3 SHOW YOUR WORK! HAPPY OCTOBER! NAME:___________________________________ 100 Points total 1. (20 points) a. A photon is emitted when an electron relaxes from the n=4 to the n=2 energy levels in a Hydrogen atom. According the Bohr model of Hydrogen, what are the wavelength and frequency of this photon? (hint: your textbook has an equation relating energy level ‘n’ to energy in the Bohr atom!) for each energy level, E = (1/n 2 ) * 2.179 x 10 -18 the energy difference, then, is 4.09 x 10 -19 J from there, we can use our equations governing the photon. frequency = 6.17 E14 Hz wavelength = 4.86 E-7 m b. That photon is travelling through space when it passes by a black hole, which ‘red-shifts’ its wavelength. Red-shifting is a phenomenon in which a gravitational body (like a black hole) literally stretches the wavelength of a nearby wave. In this case, your photon’s wavelength is doubled. What is the new energy of this photon?

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• Fall '15
• Kyger
• Atom, NE

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