Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
16th Edition
ISBN: 9781259663895
Author: KRAUSKOPF, Konrad B.
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 19, Problem 8MC
To determine
The amount of atoms or molecules present in one cubic centimetre of the space between the stars in the Milky Way.
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The average energy of an atom or molecule in a gas is 3/2 kT where k is the Boltzmann Constant, and T is the temperature in kelvins. If you were to look at all the atoms in a snapshot of the gas and sort them out by energy, what is the most probable energy you would find for an atom?
8 k T / π
1/2 kT
3/2 kT
2 kT
1.1) In a star's core the average mass number for ions which are not hydrogen or
helium is 10. The mass fractions of hydrogen is 0.60, of helium is 0.38, and all other
elements is 0.02. Calculate the average ion mass in units of mH.
1.2) Explain two assumptions behind the Kelvin-Helmholtz timescale.
1.3) In the outer core of a massive star the temperature is 108 K. The mean particle
weight is u = 0.62. Calculate the density of this region if the radiation pressure is
equal to the thermal pressure.
1.4) For temperatures around 1.5 x 10' K in a stellar core, describe why it is hydrogen
instead of heavier ions which undergo fusion. Also, when the temperature is higher,
describe why higher mass ions can undergo fusion.
1.5) Describe two possible causes of convective instability in the outer regions of a
low mass star.
Hello. I need help solving ( 9 & 10) with explanations, it goes with the diagram above. Please and thank you.
Chapter 19 Solutions
Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
Ch. 19 - Prob. 1MCCh. 19 - Prob. 2MCCh. 19 - Prob. 3MCCh. 19 - Prob. 4MCCh. 19 - Prob. 5MCCh. 19 - Prob. 6MCCh. 19 - Prob. 7MCCh. 19 - Prob. 8MCCh. 19 - Prob. 9MCCh. 19 - Prob. 10MC
Ch. 19 - Prob. 11MCCh. 19 - Prob. 12MCCh. 19 - Prob. 13MCCh. 19 - Prob. 14MCCh. 19 - Prob. 15MCCh. 19 - Prob. 16MCCh. 19 - Prob. 17MCCh. 19 - Prob. 18MCCh. 19 - Prob. 19MCCh. 19 - Prob. 20MCCh. 19 - Prob. 21MCCh. 19 - Prob. 22MCCh. 19 - Prob. 23MCCh. 19 - Prob. 24MCCh. 19 - Prob. 25MCCh. 19 - Current ideas suggest that what is responsible for...Ch. 19 - Prob. 27MCCh. 19 - Prob. 28MCCh. 19 - The expansion of the universe apparently a. has...Ch. 19 - Prob. 30MCCh. 19 - The elements heavier than hydrogen and helium of...Ch. 19 - Prob. 32MCCh. 19 - Prob. 33MCCh. 19 - Prob. 34MCCh. 19 - Prob. 35MCCh. 19 - Prob. 36MCCh. 19 - Prob. 37MCCh. 19 - Prob. 38MCCh. 19 - Prob. 39MCCh. 19 - Prob. 40MCCh. 19 - It is likely that the planets, satellites, and...Ch. 19 - Prob. 42MCCh. 19 - Prob. 43MCCh. 19 - Prob. 1ECh. 19 - Prob. 2ECh. 19 - Prob. 3ECh. 19 - The earth undergoes four major motions through...Ch. 19 - Prob. 5ECh. 19 - Prob. 6ECh. 19 - Prob. 7ECh. 19 - Prob. 8ECh. 19 - Prob. 9ECh. 19 - Prob. 10ECh. 19 - Prob. 11ECh. 19 - Prob. 12ECh. 19 - Prob. 13ECh. 19 - Prob. 14ECh. 19 - Prob. 15ECh. 19 - Prob. 16ECh. 19 - Prob. 17ECh. 19 - Prob. 18ECh. 19 - Prob. 19ECh. 19 - Prob. 20ECh. 19 - Prob. 21ECh. 19 - There is no day-night difference in cosmic-ray...Ch. 19 - Prob. 23ECh. 19 - Prob. 24ECh. 19 - Prob. 25ECh. 19 - Prob. 26ECh. 19 - Prob. 27ECh. 19 - Prob. 28ECh. 19 - Prob. 29ECh. 19 - Prob. 30ECh. 19 - What is the observational evidence in favor of the...Ch. 19 - Prob. 32ECh. 19 - Prob. 33ECh. 19 - To what event in the history of the universe can...Ch. 19 - Prob. 35ECh. 19 - Prob. 36ECh. 19 - Prob. 37ECh. 19 - Prob. 38ECh. 19 - Prob. 39ECh. 19 - Prob. 40ECh. 19 - Prob. 41ECh. 19 - Prob. 42ECh. 19 - Prob. 43ECh. 19 - Prob. 44ECh. 19 - Prob. 45E
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- It is important to have an idea about the distances between and relative sizes of celestial objects in the solar system. In Part 1 we will pretend to shrink the solar system until its center piece, the Sun, is 67.3 cm in diameter. This will represent the Sun which is 1,390,000 km in diameter. The scale of our model is thus: 67.3 cm = 4.84 x 10-5 cm km Scale 1, 390, 000 km To find the size or distance between objects in centimeters for the model, simply multiply the actual size or distance in kilometers by the scale factor above. 1. Fill in following table: Quantity Actual Distance (km) Model Distance (cm) Diameter of Sun 1,390,000 Diameter of Earth 12,760 Diameter of Moon 3,480 Distance Between Earth and Sun 1.5 x 108 Distance Between Earth and Moon 384,000 Distance to Proxima Centauri 3.97 x 1013arrow_forwardA certain radioactive material has a half-life of 8 minutes. Suppose you have a large sample of this material , containing 10^25 atoms. 5x10^24 atoms decay in the first 8 minutes and 2.5x10^24 atoms decay in the second 8 minutes. What is the ratio of the number of atoms that decay in the first 8 minutes to the number of atoms that decay in the second 8 minutes A 5/1 B 2/1 C 1/5 D 1/2arrow_forwardEstimate the temperature of the planet (in K), if it is in thermal equilibrium with the star it orbits. The radius of the star is 1,2×108 m, the radius of the planetary orbit is 5,8×1011 m, the temperature of the star surface is 2,1×103 K.arrow_forward
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