Lecture 10 Flashcards
(3 cards)
1
Q
describe the inverse square law
A
for a spherical central source, light is emitted equally in all directions
thus as you get further, the light is spread out to a larger area
A = 4piD^2
2
Q
why is it hard to use apparent brightness to determine distance of a star?
A
stars all have different intensities
3
Q
what are units for…
a) apparent brightness
b) intrinsic luminosity
A
a) J/s m^s
b) J/s
