Question

15. [2pt] Which star is brighter as seen from the Earth? (you only have one try...

15. [2pt]
Which star is brighter as seen from the Earth? (you only have one try for this problem)


A) A star with apparent magnitude 6


B) A star with apparent magnitude 15


16. [3pt]
How many times brighter is it?

Answer:

17. [2pt]
Which star is more luminous? (you only have one try for this problem)


A) A star with absolute magnitude 12


B) A star with absolute magnitude -1

Answer:  


18. [3pt]
How many times more luminous is it?

Answer:

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Homework Answers

Answer #1

16]

A star with apparent magnitude of 6 is brighter than that with 15. [answer A]

to determine the relative brightness, use

=>

=>

so, star with apparent magnitude 6 is 3981.07 times brighter than star with apparent magnitude 15.

17]

A star with absolute magnitude of - 1 is more luminous than a star with absolute magnitude of 12.

[Answer - B]

to know how luminous, use

=>

=>

so star with absolute magnitude of -1 is 158489.32 times more luminous than star with absolute magnitude 12.

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