Concept explainers
The number of joules of energy in each liter of space and the number of
Answer to Problem 8P
The number of joules of energy in each liter of space is
Explanation of Solution
The critical density of the Universe is
Therefore, the dark energy is
Convert
The mass of dark energy contains in
Write the formula to find the value of energy
Write the expression to find the energy of photon
Here,
Substitute
The dark energy present in
Substitute
The energy of
The
Conclusion:
The number of joules of energy in each liter of space is
Want to see more full solutions like this?
Chapter 18 Solutions
EXPLORATIONS:INTRO.TO...(LL)-W/ACCESS
- An electron jumps from n=3 to n=2 in a hydrogen atom in a distant galaxy, emitting light. If we detect that light at a wavelength of 3.00 mm, by what multiplication factor has the wavelength, and thus the universe, expanded since the light was emitted?arrow_forwardIf a galaxy is 500 Mly away from us, how fast do we expect it to be moving and in what direction?arrow_forwardWhat is the difference between hot dark matter and cold dark matter? How does this difference affect cosmology?arrow_forward
- Suppose you were Hubble and Humason, working on the distances and Doppler shifts of the galaxies. What sorts of things would you have to do to convince yourself (and others) that the relationship you were seeing between the two quantities was a real feature of the behavior of the universe? (For example, would data from two galaxies be enough to demonstrate Hubble’s law? Would data from just the nearest galaxies-in what astronomers call “the Local Group”-suffice?)arrow_forwardWhat percentage of matter is ordinary matter? What percentage is dark matter? What makes up the rest of the Universes density?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningModern PhysicsPhysicsISBN:9781111794378Author:Raymond A. Serway, Clement J. Moses, Curt A. MoyerPublisher:Cengage LearningAstronomyPhysicsISBN:9781938168284Author:Andrew Fraknoi; David Morrison; Sidney C. WolffPublisher:OpenStax
- Stars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage LearningFoundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage Learning