
Concept explainers
(a)
The radius of the circumsteller accretion disc using ruler.

Answer to Problem 28Q
The radius of circumstellar accretion disc is
Explanation of Solution
Calculation:
The radius of circumstellar accretion disc is one-sixth of the measuring ruler which has a total length of
The radius of circumstellar accretion disc is calculated as,
The radius of circumstellar accretion disc in km is calculated as,
Conclusion:
The radius of circumstellar accretion disc is
(b)
The orbital period of the particle at outer edge of the disc.

Answer to Problem 28Q
The orbital period of particle is
Explanation of Solution
Given:
Mass of the young star is
Formula used:
The expression of orbital period is given by,
Calculation:
The orbital period of the particle at the edge of disc is calculated as,
Conclusion:
The orbital period of particle is
(c)
The length of the jet that extends to the right of the circumstellar accretion disc and time taken by the star to traverse the entire visible range of jet.

Answer to Problem 28Q
The distance of the jet extends to the right of the disc is
Explanation of Solution
Given:
Speed of the gas is
Formula used:
The expression of time taken is given by,
Calculation:
The length of the jet which extends at the right side of the circumstellar accretion disc is one third of the total length of about
The length of jet is calculated as,
The time taken by the gas is calculated as,
Conclusion:
The distance of the jet extends to the right of the disc is
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Chapter 18 Solutions
Universe: Stars And Galaxies
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