21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 14, Problem 12QP
To determine

The description about coronal mass ejections.

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The capture of too few solar neutrinos by Davis in the solar neutrino experiment   a. can be explained if the sun is not undergoing thermonuclear fusion of hydrogen in its core.   b. indicates that the sun’s core is much cooler than expected.   c. indicates that the sun’s core is much hotter than expected.   d. indicates that the sun’s core is convective.   e. is explained by none of the above.
1. The Sun’s mass is ~2x1030 kg. If 10% of this is Hydrogen available in the core, how long will the Sun be able to continue fusing hydrogen at this rate? This is considered the Sun's "lifetime". If the Sun is 4.6 billion years old (and assuming it's power output is constant), how many years does it have left?
A helium flash occurs   a. because helium is very explosive and cannot be controlled when the nuclear reactions occur.   b. because degenerate electrons in the core do not allow the core to expand as it heats up.   c. in Cepheid variables.   d. in stars with masses less than 0.4 M.   e. under none of the above conditions.
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