To calculate the absolute magnitude of a star, what must be known in addition to the apparent magnitude?
Question 3 options:
radius
mass
distance
spectral type
Two stars of the same surface temperature are compared, and one is found to have a radius 1000 times larger than the other. How would their luminosities compare?
Question 5 options:
The larger one would have a luminosity 10 times larger than the smaller one.
The larger one would have a luminosity 100 times larger than the smaller one.
The larger one would have a luminosity 1000 times larger than the smaller one.
This is impossible, since the surface temperature of a star determines its radius.
The larger one would have a luminosity a million times larger than the smaller one.
In general, what can be said about type O and B stars compared to type K and M stars?
Question 6 options:
They are hotter and older.
They are cooler and older.
They are hotter and younger.
They are cooler and younger.
They are neither hotter nor cooler, younger nor older.
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