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 21, Problem 69Q
To determine
To explain:
Hawking
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Problem 2. The redshift is defined to be the quantity
Job – Xem
Xem
where Aob and Aem are respectively the wavelengths at which radiation is observed and emitted.
1. Find the corresponding definition in terms of observed and emitted frequencies fob and fem.
2. The observed frequency of radio waves from a distant galaxy is 5 GHz. At the location of galaxy, the
frequency is 6 GHz. Calculate the redshift of the galaxy.
3. If the galaxy was 500 Mpc away from the Milky way when the radio waves were emitted. How far away
is this galaxy today?
Briefly explain the young Helmholtz theory.
4. State the mathematical description for Wien displacement law, how this is tested in the
lab ?
5. Starting from the Plank distribution,
2he
Ba(A, T) =
A5
1
- 1
Derive Wien displacement law by maximizing the distribution.
6.
Use the Plank distribution to derive the Stefan-Boltzman Law.
Chapter 21 Solutions
Universe: Stars And Galaxies
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