Answered: We see light from a distant galaxy,…

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter11: Particle Physics And Cosmology

Section: Chapter Questions

Problem 86CP: The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a...

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We see light from a distant galaxy, galaxy “A”, with a redshift of z = 0.017. What wavelengths would we observe from the Hydrogen atom transitions from n = 5 to n = 2, from n = 4 to n = 2, and from n = 3 to n = 2?

2. Building on the previous problem, imagine there is a galaxy “B” that is in the same direction as galaxy "A", but "B" is at a redshift of z = 0.034 as seen from our Galaxy. What if the astronomers in galaxy “B” were observing galaxy “A”.... What wavelengths would they observe for these same Hydrogen transitions in galaxy “A”? (Hint: You should not have to do any calculations to answer this question, but please explain your answer carefully.)

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