21ST CENTURY ASTR.:SOLAR..(LL)-PACKAGE
6th Edition
ISBN: 9780393448498
Author: Kay
Publisher: NORTON
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Chapter 21.4, Problem 21.4CYU
To determine
The evidence of early universe obtained from CMB.
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Current evidence suggests that the universe is
a.
flat, infinite, and neither expanding nor contracting.
b.
closed, finite, and slowing its expansion.
c.
open, infinite, and slowing its expansion.
d.
open, finite, and accelerating its expansion.
e.
flat, infinite, and accelerating its expansion.
In a Universe with Ω=1, without the presence of dark energy, the expansion of the Universe would
a.
remain constant over time
b.
slow down over time
c.
reverse and then collapse
d.
speed up over time
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
Chapter 21 Solutions
21ST CENTURY ASTR.:SOLAR..(LL)-PACKAGE
Ch. 21.1 - Prob. 21.1CYUCh. 21.2 - Prob. 21.2CYUCh. 21.3 - Prob. 21.3ACYUCh. 21.3 - Prob. 21.3BCYUCh. 21.4 - Prob. 21.4CYUCh. 21 - Prob. 1QPCh. 21 - Prob. 2QPCh. 21 - Prob. 3QPCh. 21 - Prob. 4QPCh. 21 - Prob. 5QP
Ch. 21 - Prob. 6QPCh. 21 - Prob. 7QPCh. 21 - Prob. 8QPCh. 21 - Prob. 9QPCh. 21 - Prob. 10QPCh. 21 - Prob. 11QPCh. 21 - Prob. 12QPCh. 21 - Prob. 13QPCh. 21 - Prob. 14QPCh. 21 - Prob. 15QPCh. 21 - Prob. 16QPCh. 21 - Prob. 17QPCh. 21 - Prob. 18QPCh. 21 - Prob. 19QPCh. 21 - Prob. 20QPCh. 21 - Prob. 21QPCh. 21 - Prob. 23QPCh. 21 - Prob. 24QPCh. 21 - Prob. 25QPCh. 21 - Prob. 26QPCh. 21 - Prob. 27QPCh. 21 - Prob. 28QPCh. 21 - Prob. 29QPCh. 21 - Prob. 30QPCh. 21 - Prob. 31QPCh. 21 - Prob. 32QPCh. 21 - Prob. 33QPCh. 21 - Prob. 34QPCh. 21 - Prob. 35QPCh. 21 - Prob. 36QPCh. 21 - Prob. 37QPCh. 21 - Prob. 38QPCh. 21 - Prob. 39QPCh. 21 - Prob. 40QPCh. 21 - Prob. 41QPCh. 21 - Prob. 42QPCh. 21 - Prob. 43QPCh. 21 - Prob. 44QPCh. 21 - Prob. 45QP
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- Galaxies are found in the “walls” of huge voids; very few galaxies are found in the voids themselves. The text says that the structure of filaments and voids has been present in the universe since shortly after the expansion began 13.8 billion years ago. In science, we always have to check to see whether some conclusion is contradicted by any other information we have. In this case, we can ask whether the voids would have filled up with galaxies in roughly 14 billion years. Observations show that in addition to the motion associated with the expansion of the universe, the galaxies in the walls of the voids are moving in random directions at typical speeds of 300 km/s. At least some of them will be moving into the voids. How far into the void will a galaxy move in 14 billion years? Is it a reasonable hypothesis that the voids have existed for 14 billion years?arrow_forwardSome theorists expected that observations would show that the density of matter in the universe is just equal to the critical density. Do the current observations support this hypothesis?arrow_forwardDescribe at least two characteristics of the universe that are explained by the standard Big Bang model.arrow_forward
- In which model universe does the average density of the Universe equal the critical density?arrow_forwardIn which type of model universe is space-time infinite in extent and open? List all possibilities.arrow_forwardWhy cant an open universe have a center? How can a closed universe not have a center?arrow_forward
- What is the evidence that the Universe was homogeneous during its first 400,000 years?arrow_forwardUsing Ho = 20.8 km/s/Mly and assuming the expansion rate has been constant, find out how long the universe has been expanding.arrow_forwardWhat started the clumping of matter in the early universe that eventually became the seeds of large-scale formation of superclusters of galaxies? a. magnetic and electric field fluctuations b. subatomic quantum fluctuations c. temperature differences d. pressure differences e. none of the abovearrow_forward
- Considering the reactions in primordial nucleosynthesis only, what would be the impact on the universe today if the neutron lifetime were much smaller than 886s (the actual value of the neutron lifetime)? Select one: O a. Annihilations mean that the universe is left composed entirely of photons and neutrinos O b. There would be no difference to the actual universe O c. Only hydrogen atoms would be present today O d. There would be very small amounts of 4He in the universe todayarrow_forwardWe know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ... a.Expand and go supernova due to the expansion of the Universe b.Fly away from the galaxy because the stars’ velocities are so large, and the galaxy would not have enough gravity to hold onto them c.Orbit the center of the galaxy normally d.Spiral in toward the center of the galaxy because most of the galaxy’s mass would be toward the centerarrow_forward6. If the cosmological microwave background was emitted by a plasma with a temperature temperature of 4000 K and is observed with a temperature of 2.73 K today, at what redshift was it emitted? (Assume Wien's law.) By what factor did the scale of the universe between these two epochs?arrow_forward
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