21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780309341523
Author: Kay
Publisher: NORTON
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Chapter 23, Problem 6QP
To determine
The far distant future of the universe.
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What was the lowest temperature for photons to be able to produce 0 particles in the early universe? Approximately what time was this? Let kT = mc2 and use Figure. Use the mean value of the distribution
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Chapter 23 Solutions
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- What is the fate of a closed universe? In what case would that not be true?arrow_forwardWhat is the difference between hot dark matter and cold dark matter? How does this difference affect cosmology?arrow_forwardWhat does the size difference of the irregularities in the background radiation tell us about the universe?arrow_forward
- Which one best explains dark matter? The resurgence of Newtonian physics or Einstein’s cosmological constant?arrow_forwardWhat major factor determines the future of the universe? Why?arrow_forwardIf you observe light emitted from a distance object when the cosmic background temperature was Tz=54K, what is the redshift z of that light? At that redshift, what was the diameter Dz of the universe at that time compared to the diameter of today's universe D0?arrow_forward
- As the universe expands, which type of cosmic energy has a density that falls off most quickly? 1. Dark energy density 2. Dark matter density 3. Normal matter density 4. Radiation energy densityarrow_forwardAll of the matter that we know (dark matter excluded) is made out of quarks and leptons. HINT: The electron is a type of lepton, protons and neutrons are made out of quarks. True Falsearrow_forwardAccording to the standard Big Bang theory (neglecting any effects of cosmic acceleration), what is the maximum possible age of the universe if H0 = 50 km/s/Mpc? 70 km/s/Mpc? 80 km/s/Mpc?arrow_forward
- What has occurred after the Big Bang? Objects in the universe have reached a critical density. Objects that were once close together have moved apart as space expanded. Space expanded without affecting the distances between objects. Objects that were once close together have expanded apart into already existing space.arrow_forwardWhat is dark energy and what evidence do astronomers have that it is an important component of the universe?arrow_forwardWhy couldnt atomic nuclei exist when the Universe was less than about 2 minutes old?arrow_forward
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