I.
A) What is the flux and luminosity of a star with five times the radius but a third the
temperature of the Sun?
Flux: Need distance to calculate flux.
Luminosity: 0.30864
B)
Consider a light source (object) at 10.0 cm with a lens at 35.0 cm on the track.
If
the mean image distance is 60.0 cm, what is the focal length of this lens?
1/f=1/60+1/25=17.6470588256
Focal Length: 17.6470588256
C)
Consider Star A to have a magnitude of 3.00 while Star B has a magnitude of
2.50.
How much brighter is Star B than Star A?
3-2.5=0.5^1/2= 1.5849
Brightness: 1.5849 times brighter.
II.
A) What is the flux and luminosity of a star with three times the radius but a third the
temperature of the Sun?
Flux: Need distance to calculate flux.
Luminosity: 0.1111
B)
Consider a light source (object) at 10.0 cm with a lens at 15.0 cm on the track.
If the mean image distance is 50.0 cm, what is the focal length of this lens?
1/f=1/50+1/5 f=4.545
Focal Length: 4.545
C)
Consider Star A to have a magnitude of 3.00 while Star B has a magnitude of
2.50.
How much brighter is Star B than Star A?
3-2.5=0.5^1/2= 1.5849
Brightness: 1.5849 times brighter.
III.
A) What is the flux and luminosity of a star with six times the radius but a third the
temperature of the Sun?
Flux: Need distance to calculate flux.
Luminosity: 0.4444
B)
Consider a light source (object) at 10.0 cm with a lens at 25.0 cm on the track.
If
the mean image distance is 60.0 cm, what is the focal length of this lens?
1/f=1/60+1/15 f=12.0000000005
Focal Length: 12.0000000005
C)
Consider Star A to have a magnitude of 3.00 while Star B has a magnitude of
2.50.
How much brighter is Star B than Star A?
3-2.5=0.5^1/2= 1.5849
Brightness: 1.5849 times brighter.
