21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
6th Edition
ISBN: 9780393874921
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 22.4, Problem 22.4CYU
To determine
The correct statement
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
The cosmic "dark ages" represent that time in the history of the universe
when:
the inflation of a singularity in the first trillionth of a trillionth of a second of
time when matter and energy were interchangeable and darkness prevailed
atoms of H and He had not formed yet, so the dark ages represent the time
just before the release of the cosmic microwave background
dark energy came into being around 5 to 6 billion years ago, accelerating the
expansion of the universe
the light of the cosmic microwave background began to dim and stars and
galaxies had yet to form
photons of light energy were trapped within a plasma of H and He nuclei and
loose electrons, creating a foggy, opaque universe
MacBook Air
Explain Fermi Paradox?
Assume a flat FRW universe, dominated by radiation throughout its history. Calculate the physical, cosmological horizon size at t=t_0 The initial conditions for the scale factor are a=a_0 at t=t0(today). Which asnwer is correct;
a)R_H=2a_0ct_0
b) R_H = 3a_0ct_0
c)R_H = ct_0
d) R_H=2ct_0
Chapter 22 Solutions
21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
Ch. 22.1 - Prob. 22.1CYUCh. 22.2 - Prob. 22.2CYUCh. 22.3 - Prob. 22.3CYUCh. 22.4 - Prob. 22.4CYUCh. 22.5 - Prob. 22.5CYUCh. 22 - Prob. 1QPCh. 22 - Prob. 2QPCh. 22 - Prob. 3QPCh. 22 - Prob. 4QPCh. 22 - Prob. 5QP
Ch. 22 - Prob. 6QPCh. 22 - Prob. 7QPCh. 22 - Prob. 8QPCh. 22 - Prob. 9QPCh. 22 - Prob. 10QPCh. 22 - Prob. 11QPCh. 22 - Prob. 12QPCh. 22 - Prob. 13QPCh. 22 - Prob. 14QPCh. 22 - Prob. 15QPCh. 22 - Prob. 16QPCh. 22 - Prob. 17QPCh. 22 - Prob. 18QPCh. 22 - Prob. 19QPCh. 22 - Prob. 20QPCh. 22 - Prob. 21QPCh. 22 - Prob. 22QPCh. 22 - Prob. 24QPCh. 22 - Prob. 28QPCh. 22 - Prob. 29QPCh. 22 - Prob. 31QPCh. 22 - Prob. 32QPCh. 22 - Prob. 33QPCh. 22 - Prob. 34QPCh. 22 - Prob. 35QPCh. 22 - Prob. 36QPCh. 22 - Prob. 37QPCh. 22 - Prob. 38QPCh. 22 - Prob. 39QPCh. 22 - Prob. 40QPCh. 22 - Prob. 41QPCh. 22 - Prob. 42QPCh. 22 - Prob. 43QPCh. 22 - Prob. 44QPCh. 22 - Prob. 45QP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Why couldnt atomic nuclei exist when the Universe was less than about 2 minutes old?arrow_forwardSuppose astronomers discover a radio message from a civilization whose planet orbits a star 35 lightyears away. Their message encourages us to send a radio answer, which we decide to do. Suppose our governing bodies take 2 years to decide whether and how to answer. When our answer arrives there, their governing bodies also take two of our years to frame an answer to us. How long after we get their first message can we hope to get their reply to ours? (A question for further thinking: Once communication gets going, should we continue to wait for a reply before we send the next message?)arrow_forwardState the problems of the Hot Big Bang model in cosmology, and briefly explain how inflation solves these problems.arrow_forward
- The present number density of electrons in the Universe is the same as that of protons, about 0.2 m-3. Consider a time long before the formation of the microwave background, when the scale factor was x times smaller than its present value. What was the number density of electrons then? Value: x = 12×106arrow_forwardWhere did all the antimatter go?arrow_forwardSuppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 2.1 × 108 kg. Consider the kinetic energy required at 13 % of the speed of light. If energy to get a spaceship to cruising speed is generated using matter-antimatter annihilation, what mass of antimatter in kg is required? Hint: Matter-antimatter annihilation converts an entire mass of matter and antimatter into pure energy with no loss.arrow_forward
- Suppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 3.1 × 108 kg. Consider the kinetic energy required at 13 % of the speed of light. If energy to get a spaceship to cruising speed is generated using matter-antimatter annihilation, what mass of antimatter in kg is required?Hint: Matter-antimatter annihilation converts an entire mass of matter and antimatter into pure energy with no loss.arrow_forwardWhat 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 distributionarrow_forwardThe cosmic microwave background radiation is strong evidence for the Big Bang theory because it: (a) Directly shows the explosion that created the universe. (b) Represents the afterglow of the hot, early universe. (c) Is a leftover radiation from the formation of stars and galaxies. (d) Only exists in specific regions of the observable universe.arrow_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_forwardCite an evidence that we are living in an expanding universe.arrow_forwardThe background radiation has an average temperature of 2.7 K, using Wien’s Law, the current background radiation in the microwave region, the peak wavelength is 1mm. In the past, when the cosmic background radiation had a peak wavelength of 51.1 µm, calculate the relative size of the universe compared to the current size of the universe, that is, the universe was how much smaller by a factor of what? Round to TWO places past the decimalarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- AstronomyPhysicsISBN:9781938168284Author:Andrew Fraknoi; David Morrison; Sidney C. WolffPublisher:OpenStaxFoundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage LearningStars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage Learning
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Astronomy
Physics
ISBN:9781938168284
Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher:OpenStax
Foundations of Astronomy (MindTap Course List)
Physics
ISBN:9781337399920
Author:Michael A. Seeds, Dana Backman
Publisher:Cengage Learning
Stars and Galaxies (MindTap Course List)
Physics
ISBN:9781337399944
Author:Michael A. Seeds
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
General Relativity: The Curvature of Spacetime; Author: Professor Dave Explains;https://www.youtube.com/watch?v=R7V3koyL7Mc;License: Standard YouTube License, CC-BY