Concept explainers
(a)
The average speed of a Hydrogen atom in the Sun’s atmosphere.

Answer to Problem 47Q
Explanation of Solution
Given:
Temperature of atmosphere of present day Sun is
Mass of hydrogen atom is
Boltzmann constant
Formula used:
Average speed of an atom is given by the formula,
Where
Calculation:
Substitute the values
Conclusion:
The average speed of a Hydrogen atom in the Sun’s atmosphere where temperature is
(b)
The average speed of a Hydrogen atom in the

Answer to Problem 47Q
Explanation of Solution
Given:
Temperature of atmosphere of
Mass of hydrogen atom is
Boltzmann constant
Formula used:
Average speed of an atom is given by the formula,
Where
Calculation:
Conclusion:
The average speed of a Hydrogen atom in the
(c)
Comparison of the two average values of a Hydrogen atom in the atmospheres of present-day Sun and the

Explanation of Solution
Given:
Escape speed from a red giant =
Escape speed from the present-day sun =
According to the calculations, the escape speed of an atom in the atmosphere of a red giant is much lower than the escape speed from the atmosphere of the present-day Sun. However, there is not much difference in the average speeds in the respective atmospheres as they are
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Chapter 19 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
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