Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 10, Problem 2RQ
To determine
How the contraction of an inert helium core triggers the ignition of a hydrogen-fusion shell
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Compare the energy produced per kg of fuel for the combustion of coal, d-d fusion and d-t fusion.d-d: _____________ ×107 MJ/kg
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Compare the energy produced per kg of fuel for the combustion of coal, d-d fusion and d-t fusion.d-d: _____________ ×107 MJ/kgd-t: _____________ ×108 MJ/kg
Chapter 10 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 10 - Why does helium fusion require a higher...Ch. 10 - Prob. 2RQCh. 10 - Prob. 3RQCh. 10 - Prob. 4RQCh. 10 - Prob. 5RQCh. 10 - Prob. 6RQCh. 10 - Prob. 7RQCh. 10 - Prob. 8RQCh. 10 - Prob. 9RQCh. 10 - Prob. 10RQ
Ch. 10 - Prob. 11RQCh. 10 - How can you explain the Algol paradox?Ch. 10 - Prob. 13RQCh. 10 - Prob. 14RQCh. 10 - Prob. 15RQCh. 10 - Prob. 16RQCh. 10 - Prob. 1DQCh. 10 - Prob. 2DQCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 1LTLCh. 10 - Prob. 2LTLCh. 10 - Prob. 3LTL
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- Why is fission not an important energy source in the Sun?arrow_forwardConsider the two nuclear reactions I: A + B → C + E II: C + D → F + G(a) Show that the net disintegration energy for these two reactions (Qnet = QI + QII) is identical to the disintegration energy for the net reaction A + B + D → E + F + G(b) One chain of reactions in the Sun’s core is the protonproton cycle. Based on part (a), what is Qnet for this sequence?arrow_forwardThe 2-H formed in the first reaction has less mass than the two 1-H that form it; the missing mass converts to other forms of energy according to E = mc2 (this ultimately is the energy source that keeps the Sun's core at 15 million degrees Celsius). You will find the amount of mass converted to energy by carefully using a calculator. Using the numbers in the Atomic Mass column, calculate H + H- D. Type the entire calculator answer carefully. [it should be positive, similar in style %3D to 0.002179] (1) (2) Element (3) Symbol (4) Mass Number, (5) Atomic Mass (6) % Abundance (or Radioactive Decay Mode) (7) Half-life Atomic Number Z. (if radioactive) (Neutron) 1.008665 10.4 min Hydrogen Deuterium Tritium H. 1.007825 2.014102 99.985% 0.015% 3 3.016049 12.33 yr Helium Не 3 3.016029 4.002602 0.000137% 99.999863% 4 Lithium Li 6. 6.015121 7.016003 7.5% 92.5% 7 4 Beryllium Be 7.016928 EC, 7 53.29 days 9. 9.012182 100%arrow_forward
- 7arrow_forwardAbout 2% of the energy generated in the Sun’s core by the p-p reaction is carried out of the Sun by neutrinos. Is the energy associated with this neutrino flux equal to, greater than, or less than the energy radiated from the Sun’s surface as electromagnetic radiation?arrow_forwardWe saw that, on Earth, the number flux of solar neutrinos from the p-p chain is 6.7E10 s-1 cm-2. Other nuclear reactions in the Sun supplement this neutrino flux with a small additional flux of higher-energy neutrinos. A neutrino detector in Japan, named Super Kamiokande, consists of a tank of 50kton of water, surrounded by photomultiplier tubes. The tubes detect the flash of Cerenkov radiation emitted by a recoiling electron when a high-energy neutrino scatters on it. Calculate the detection rate for neutrino scattering in events per day, if 10-6 of the solar neutrinos have a high enough energy to be detected by this experiment, and each electron poses a scattering cross section=10-43 cm. Hint: Consider the density of neutrino targets "seen" by an individual electron, with a relative velocity of c between the neutrinos and the electron, to obtain the rate at which one electron interacts with the incoming neutrinos, and multiply by the total number of electrons (I've already done this:…arrow_forward
- The nuclear process for fusing helium into carbon is often called the “triple-alpha process.” Why is it called as such, and why must it occur at a much higher temperature than the nuclear process for fusing hydrogen into helium?arrow_forwardWhy is a higher temperature required to fuse hydrogen to helium by means of the CNO cycle than is required by the process that occurs in the Sun, which involves only isotopes of hydrogen and helium?arrow_forwardSuppose the proton-proton cycle in the Sun were to slow down suddenly and generate energy at only 95% of its current rate. Would an observer on Earth see an immediate decrease in the Sun’s brightness? Would she immediately see a decrease in the number of neutrinos emitted by the Sun?arrow_forward
- How is a neutrino different from a neutron? List all the ways you can think of.arrow_forwardNeutrino oscillations can occur only if neutrinos have a mass. Why?arrow_forwardThe probability of two protons tunneling in the Sun's core is Ptunnel 1010. This means that out of each 1010 pairs of protons, one pair tunnels successfully. Make an estimate showing that this probability can account for the 1038 fusion reactions that take place each second in the Sun's core. Hint: Assume that the Sun's core contains about 40% of its mass.arrow_forward
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