Astrophysics Flashcards
1
Q
What is the rayleigh criterion
A
the minimum distance between two point sources such that their presence can be distinguished in the image
2
Q
Why would satellites that detect UV rays might want to be in space?
A
UV rays are absorbed by the ozone layer
3
Q
Advantage of using a UV ray telescope?
A
clearer resolution
4
Q
What is apparent magnitude?
A
The ‘brightness’ of a star
5
Q
What is luminosity?
A
The total power the star radiates
6
Q
What is intensity?
A
power per unit area
7
Q
How many meters is a light year?
A
9.46x10^15m
8
Q
How many meters is an astronomical unit (AU)?
A
1.5x10^11m
9
Q
How many meters is one parsec (pc)?
A
3.26ly, 3.08x10^16
10
Q
What is absolute magnitude?
A
What the apparent magnitude would be when the star is 10 parsecs away
