Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 19, Problem 16Q
To determine
The changes in the universe if
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Why does primordial nuclesythesis end about 3 minutes after the Big Bang ?
select one :
a. The number densities of photons is too large at this time and the photons induce fission , stopping nuclei formation
b. The universe is tooo hot at t=3 minutes
c. The number densities of neutrons and protons and other nuclei are too small at this time and fusion fades out .
d. Deuterium has a lifetime of 3 minutes , so after this time no more deuterium survives as it decays away ?
Astronomers can determine the heat of various areas of the universe by making observations about energy they emit. Gamma rays can be found in areas where there is a lot of star formation occurring.
What would you guess about the temperature of these areas? Explain why.Do you think there would be a lot of particles present? Explain why.
What is the percentage difference mass loss between a Helium nucleus and 4 protons?
My math came out to 99% but I think I did something wrong (this assumes the mass for of 4 protons is 6.6792 x 10^-27kg and a the mass of a helium nucleus is 6.6892e x 10^-27kg (Units need to be in kilograms to use with e=mc^2)
Chapter 19 Solutions
Universe
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Ch. 19 - Prob. 11CCCh. 19 - Prob. 12CCCh. 19 - Prob. 13CCCh. 19 - Prob. 14CCCh. 19 - Prob. 15CCCh. 19 - Prob. 1QCh. 19 - Prob. 2QCh. 19 - Prob. 3QCh. 19 - Prob. 4QCh. 19 - Prob. 5QCh. 19 - Prob. 6QCh. 19 - Prob. 7QCh. 19 - Prob. 8QCh. 19 - Prob. 9QCh. 19 - Prob. 10QCh. 19 - Prob. 11QCh. 19 - Prob. 12QCh. 19 - Prob. 13QCh. 19 - Prob. 14QCh. 19 - Prob. 15QCh. 19 - Prob. 16QCh. 19 - Prob. 17QCh. 19 - Prob. 18QCh. 19 - Prob. 19QCh. 19 - Prob. 20QCh. 19 - Prob. 21QCh. 19 - Prob. 22QCh. 19 - Prob. 23QCh. 19 - Prob. 24QCh. 19 - Prob. 25QCh. 19 - Prob. 26QCh. 19 - Prob. 27QCh. 19 - Prob. 28QCh. 19 - Prob. 29QCh. 19 - Prob. 30QCh. 19 - Prob. 31QCh. 19 - Prob. 32QCh. 19 - Prob. 33QCh. 19 - Prob. 34QCh. 19 - Prob. 35QCh. 19 - Prob. 36QCh. 19 - Prob. 37QCh. 19 - Prob. 38QCh. 19 - Prob. 39QCh. 19 - Prob. 40QCh. 19 - Prob. 41QCh. 19 - Prob. 42QCh. 19 - Prob. 43QCh. 19 - Prob. 44QCh. 19 - Prob. 45QCh. 19 - Prob. 46QCh. 19 - Prob. 47QCh. 19 - Prob. 48QCh. 19 - Prob. 49QCh. 19 - Prob. 50QCh. 19 - Prob. 51QCh. 19 - Prob. 52QCh. 19 - Prob. 53QCh. 19 - Prob. 61Q
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- Multiply the following BINARY NUMBERS 10101.1111 X 101.11 (Note: The problem should be solved in separate paper with steps and scanned copy should be submitted along with other answers The final answer must also be entered in the boxes below. Enter only one bit in a box and fill the unused boxes if any, with zeros) Answer - Integer part = Answer - Fractional part=arrow_forwardA speck of carbon dust may contain as many as 30 billion atoms of carbon, each atom having a mass of 2.00 x 10-23 grams. Suppose the mass of all the atoms in a speck of carbon dust were converted entirely to energy and applied to the kinetic energy of a baseball. How fast would the baseball be moving? (Mass of baseball = 0.145 kg. ) (1 gram = 1 x 103kg) (KE = ½ mv2) (1 billion = 1 x 109)arrow_forwardwhere did the 50 x 10^-3 come from and how did you get the math of -7.5arrow_forward
- I. NUCLEAR EQUATION: You are going to write the nuclear equations for the following fusion reactions responsible for the abundance of lighter nuclei in the universe. 1. Fusion of two Deuterium isotopes to form Helium3 2. Fusion of Deuterium and a neutron to form Tritium 3. Fusion of Deuterium and a proton to form Heliumarrow_forwardGive the starting value a, the growth/decay rate r, and the continuous growth/decay rate k. If there is exponential is decay your growth ates should be negative. For help entering logarithms, see help (logarithms) 2 = 0.208 - (e0.22)€ nas: help (numbers) help (numbers) help (numbers)arrow_forwardThe radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a nyass of 63 milligrams, find an expression for the mass after t hours. (b) How much will remain after 85 hours? (Round your answer to one decimal place.) When will the initial mass decay to 15 milligrams? (Round your answer to one decimal place.)arrow_forward
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