Problem 1: Stars X and Y have the same temperature, but the radius of star X is 3 times larger than the radius of star Y. We conclude that: Select one:
a. Star Y will appear brighter to an observer on Earth.
b. Star X will appear brighter to an observer on Earth.
c. The luminosity of star X is 9 times larger than the luminosity of star Y.
d. Star Y will appear more red to an observer on Earth.
e. The absolute magnitude of star X is 9 times larger than the absolute magnitude of star Y.
Problem 2: Star Z has absolute magnitude 1 and Star Y has absolute magnitude 4. We conclude that: Select one:
a. Star Y is 3 times closer than star Z.
b. Star Y appears to us brighter than star Z.
c. Star Z appears to us brighter than star Y
d. In the H-R diagram, star Z will be closer to the top than star Y.
e. Star Z is 4 times closer than star Y.
Problem 3: Star S has apparent magnitude 1 and star K has apparent magnitude 4. We conclude that: Select one:
a. Star K is 4 times brighter than star S.
b. Star K is 3 times brighter than star S.
c. Star S is 4 times brighter than star K.
d. None of the choices listed is correct.
e. Star S is 3 times brighter than star K.
Problem 4: Star S and Star K have the same tangential velocity, but Star S is closer to Earth. Which has the larger proper motion? Select one:
a. The answer cannot be determined from the information given.
b. Star K.
c. They both have the same proper motion.
d. Star S.