Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 22, Problem 10Q
To determine

The reason for hydrogen atom to emit a photon of wavelength 21 cm

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Consider the electron in a hydrogen atom that receives an incoming photon.  If the electron began at an energy level of n = 3, at which of the following energy levels (n) could it exist upon absorbing the photon?       A) n = 5   B)  n = 1   C)  n = 1.5   D)  n = 6.5   E)  Either n = 5 or n = 6.5
Assuming that the Sun is a blackbody with a temperature of 6,000 K, at what wavelength does it radiate the most energy? [4.8 x 10‐7 m]
Suppose we detect red photons at 656 nm emitted by electrons dropping from the n = 3 to the n = 2 orbital in hydrogen. The hydrogen is in an interstellar cloud at 5000k. If the cloud were heted to 10000 K, what would be the wavelength of the photons emitted by the transition?  a) 328 nm b) 656 nm c) 1312 nm d) 658 nm e) 654 nm
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