21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 22, Problem 11QP
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The correct statement
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Students have asked these similar questions
The density of the universe is
a.
equal to the critical density if the universe is closed.
b.
equal to the critical density if the universe is flat.
c.
greater than the critical density if the universe is flat.
d.
greater than the critical density if the universe is open.
e.
none of the above.
10.
In most models for the early universe, which was the first force to have frozen out of the original Supersymmetric force?
a.
Weak Nuclear Force.
b.
Strong Nuclear Force.
c.
Gravity.
d.
Electromagnetism.
The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A.
It slowly works its way to the Sun’s surface, where it escapes into space.
B.
It rapidly escapes from the Sun, traveling into space at nearly the speed of light.
C.
It is rapidly converted to energy when it meets an ordinary electron, resulting in matter-antimatter annihilation.
D.
It quickly meets an ordinary electron, forming an electron-positron pair that remains stable.
E.
It joins with a nearby neutron to form a proton.
Chapter 22 Solutions
21st Century Astronomy
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
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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
- What are the largest known structures in the Universe?arrow_forwardIn 1998, it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang? a. A force exists that we knew nothing about causes the expansion. b. The universe must be closed. c. The universe is finite. d. The amount of dark matter must be far less than the amount of normal matter. e. The universe must be infinitely old.arrow_forwardIf the inner accretion disk around a black hole has a temperature of 10 6 K, at what wavelength will it radiate the most energy? a. 106 nm b. 3 nm c. 3 × 106 nm d. 1 nm e. 3 × 1011 nmarrow_forward
- An isolated black hole in space would be difficult to detect because a. there would be no light source nearby. b. it would not be rotating rapidly. c. it would be stationary. d. very little matter would be falling into it. e. there would be very few stars behind it whose light it could block out.arrow_forward4. Which of the following constituents of the Universe is present in the highest fraction in terms of its contribution to the total energy of the Universe? a. Dark Matter. b. Dark Energy. c. Light. d. Normal (baryonic) matter.arrow_forwardThe universe has a. an edge and a center. b. an edge but no center. c. a center but no edge. d. no edge and no center.arrow_forward
- If the universe is closed and finite, then a. the universe has a center and an edge. b. the universe will expand forever. c. the final fate of the universe will be very cold and of extremely low density. d. the space-time of the universe is negatively curved. e. none of the above are true.arrow_forwardGalaxy seeds around which galaxies, clusters, and walls grew may have been a. caused by hot dark matter. b. caused by baryons. c. the result of the separation of the electromagnetic and weak forces. d. the result of freezing water molecules shortly after the universe became transparent to photons. e. caused by microscopic random fluctuations in the infant universe.arrow_forward1. If a proton is moving at very high speed, so that its kinetic energy is much greater than its rest energy (mc²), can it then decay via p →n + n+? 2. What would an “antiatom," made up of the antiparticles to the constituents of normal atoms, consist of? What might happen if antimatter, made of such antiatoms, came in contact with our normal world of matter?arrow_forward
- The flatness problems states that a. the density of the universe is very close to the critical density. b. the density of the universe is much larger than the critical density. c. the flat universe would expand forever and we could never measure the density of the universe. d. the laws of physics may not be different at different times in the history of the universe. e. the redshift of a distant galaxy is caused by the curvature of space-time.arrow_forwardIf the mass density of the universe is above the critical density as it appears to be with the mass detected so far, then the universe is a. flat b. negatively curved C. in steady state d. positively curvedarrow_forwardThe age of the universe can be determined if a. the universe is flat. b. the amount of dark matter in the universe can be accurately determined. c. the rate of recession of the galaxies in the Local Group can be accurately determined. d. the temperature of the cosmic background radiation can be accurately determined. e. the Hubble constant and density of the universe can be accurately determined.arrow_forward
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