Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 26, Problem 4Q
To determine
The reason for non-violation of the statement,“Inflationary model does not oppose the principle that the speed of the light in vacuum represents its ultimate speed limit”.
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Chapter 26 Solutions
Universe: Stars And Galaxies
Ch. 26 - Prob. 1QCh. 26 - Prob. 2QCh. 26 - Prob. 3QCh. 26 - Prob. 4QCh. 26 - Prob. 5QCh. 26 - Prob. 6QCh. 26 - Prob. 7QCh. 26 - Prob. 8QCh. 26 - Prob. 9QCh. 26 - Prob. 10Q
Ch. 26 - Prob. 11QCh. 26 - Prob. 12QCh. 26 - Prob. 13QCh. 26 - Prob. 14QCh. 26 - Prob. 15QCh. 26 - Prob. 16QCh. 26 - Prob. 17QCh. 26 - Prob. 18QCh. 26 - Prob. 19QCh. 26 - Prob. 20QCh. 26 - Prob. 21QCh. 26 - Prob. 22QCh. 26 - Prob. 23QCh. 26 - Prob. 24QCh. 26 - Prob. 25QCh. 26 - Prob. 26QCh. 26 - Prob. 27QCh. 26 - Prob. 28QCh. 26 - Prob. 29QCh. 26 - Prob. 30QCh. 26 - Prob. 31QCh. 26 - Prob. 32QCh. 26 - Prob. 33QCh. 26 - Prob. 34QCh. 26 - Prob. 35QCh. 26 - Prob. 36QCh. 26 - Prob. 37QCh. 26 - Prob. 38QCh. 26 - Prob. 39QCh. 26 - Prob. 40QCh. 26 - Prob. 41QCh. 26 - Prob. 42QCh. 26 - Prob. 43QCh. 26 - Prob. 44QCh. 26 - Prob. 45QCh. 26 - Prob. 46QCh. 26 - Prob. 47Q
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- Shown here is the Hawking equation that describes radiation from black holes: 2hG Where: S- entropy (J/K) A- area of the event horizon (m2) k-Boltzman's constant (m² kg/s² K) | c- speed of light h- Planck's constant (m2 kg/s) G- universal gravitation constant (m³/kg s²) a) Using the equation and units of the other terms, find the units for c. %3D b) In this system of units, c = 2.99 x 10%. Convert this to miles/hour.arrow_forwardExplain the term Gravitational lensing?arrow_forwardThe discovery of the dark energy was a surprise because astrophysicists generally assumed that the expansion would be slowing down. Select one: True Falsearrow_forward
- Olbers’s paradox deals with which of these questions? a. Is the universe accelerating? b. Why is the sky dark at night? c. Is the universe expanding? d. Why does the sun shine so brightly? e. none of the abovearrow_forwardDoes Hubble's Law work well for galaxies in the Local Group (such as Andromeda)? No, because dark energy is accelerating the universe's expansion over those distances. No, because we do not know the precise value of Ho. No, because Hubble did not know the Local Group existed when he discovered his law. Yes, it works well for all galaxies. No, because galaxies in the Local Group are bound gravitationally together.arrow_forwardAssume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements). Take the helium mass fraction as 1/4. How many electrons are there in the observable Universe? Enter your answer in scientific notation with one decimal place. Value: n = 4*1080arrow_forward
- Explain how special relativity differs from general relativity.arrow_forwardIf a galaxy is 9.0 Mpc away from Earth and recedes at 488 km/s, what is H0 (in km/s/Mpc)? km/s/Mpc What is the Hubble time (in yr)? years How old (in yr) would the universe be, assuming space-time is flat and the expansion of the universe has not been accelerating? How would acceleration change your answer? A.If the expansion of the Universe has been accelerating, the Universe could be substantially younger than the value entered above. BIf the expansion of the Universe has been accelerating, the Universe could be substantially older than the value entered above.arrow_forwardIf the Sun was shrunk to fit the same mass into a smaller volume what would happen to the curvature of spacetime near the surface of the Sun? Spacetime curvature wouldn't change as the mass hasn't changed. Spacetime curvature would stay the same (which we would feel as the same gravity at the surface) Spacetime curvature would increase (which we would feel as an increase in gravity near the surface) Spacetime curvature would decrease (which we would feel as a decrease in gravity near the surface)arrow_forward
- What fact of nature motivated the development of special relativity? Explain why Galilean relativity is inconsistent with that fact.arrow_forward. The temperature of background radiation left over from the Big Bang during the creation of the universe is 3 K. What is the temperature of the universe a) in °C? b) in °F?arrow_forwardExplain the expected fate of the universe in entropic terms.arrow_forward
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