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hw5 - Astronomy 121 Spring 2011 Homework 5 due date March 4...

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Astronomy 121, Spring 2011 Homework 5 due date: March 4 Reading: Chap. 4 Answer in complete sentences and show your calculations. Light and Energy Levels 1. (10 pts) Consider a photon with a frequency of 5 . 64 × 10 14 Hz. (a) What is the photons wavelength? (b) What is the corresponding energy of this wave? (c) What part of the spectrum is this? If it is in the visible portion, what color does it correspond to? 2. (10 pts) An electron in a certain atom makes a transition from an excited state to the ground state. The atom emits a photon with a wavelength 122 nm. What is the difference in energy between the two energy levels? 3. (10 pts) We observe an absorption line at a wavelength of 656 nm. Could a 5 eV photon have caused this transition? (Note that 1 eV = 1 . 602 × 10 - 19 J). Spectra 4. (10 pts) List three properties of a star that can be determined from observations of its spectrum. For each, describe how the property is determined from the spectrum.
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