21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 1.3, Problem 1.3CYU
To determine
What evidence to the pattern in nature.
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What happens when a particle and its antiparticle collide?
a
They combine nuclei
b
They break into quarks
c
They are converted to energy
d
They become antimatter
4. How does an electron differ from a positron?5. Why is proton-proton chain reaction important in stellar formation and evolution?
Star Trek fans have often heard the term “antimatter drive.” Describe how you could use a magnetic field to trap antimatter, such as produced by nuclear decay, and later combine it with matter to produce energy. Be specific about the type of antimatter, the need for vacuum storage, and the fraction of matter converted into energy.
Chapter 1 Solutions
21st Century Astronomy (fifth Edition)
Ch. 1.1 - Prob. 1.1CYUCh. 1.2 - Prob. 1.2CYUCh. 1.3 - Prob. 1.3CYUCh. 1 - Prob. 1QPCh. 1 - Prob. 2QPCh. 1 - Prob. 3QPCh. 1 - Prob. 4QPCh. 1 - Prob. 5QPCh. 1 - Prob. 6QPCh. 1 - Prob. 7QP
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- Problem 1. Interstellar Cloud Collapse: Jeans Criteria James Jeans discovered that only clouds of mass greater than a certain threshold can collapse to form stars. You will reconstruct a derivation of the Jeans Mass. a. Gravitational Equilibrium: A stable orbit of an object of mass m around another object of mass M requires that the energy of motion or “kinetic” energy of the object be a certain proportion of its gravitational binding energy or “potential” energy. The kinetic energy, KE, is defined KE = 1/2mv^2 where m is the mass of the object and v is its speed. The gravitational potential energy is defined as U = -(GMm)/(r) where G is the gravitational constant of Newton’s so-called Universal Law of Gravitation, M and m are the masses of the interacting objects and r is the radius of the orbit. The total energy, E, of the object of mass m is the sum of its kinetic and potential energies, E = KE + U. Note the minus sign in the definition of potential energy. This…arrow_forwardShow how the Hubble constant is used to make the simplest approximation for how long ago the Big Bang occurred {Assume a constant expansion rate}. (This is a qualitative question)arrow_forwardWhat is unified atomic mass unit? Explain.arrow_forward
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