21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 21, Problem 15QP
To determine

The elements which are not created as a result of Big Bang.

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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.
1. 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?
Which of the following statements about the cosmic background radiation is NOT true?   A. It has a temperature of about 3 degrees K above absolute zero.   B. It is the result of a mixture of radiation from many independent sources, such as stars and galaxies.   C. It had a much higher temperature in the past.   D. It was discovered by Penzias and Wilson in the early 1960s   E. It appears essentially the same in all directions (it is isotropic).
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