•Question 5 If Galaxy A is four times more
distant than Galaxy B, then
according to the Hubble Law, the recessional velocity of Galaxy A is larger than that of Galaxy B by what
factor?
a.2 times. b.4 times. c.8 times. d.16 times. e.32 times.
•The Hubble Law is LINEAR. The redshift v = Hxd. Four times the distance, four times the velocity.
•
•Question 6 If a galaxy has a radial
velocity (redshift) of 5000 km/s, how far away is it? Assume a Hubble Constant of 70
km/s/Mpc.
a.7 Mpc b.20 Mpc c.49
Mpc d.71 Mpc e.100 Mpc
•V = Hxd, so d = v/H = 5000 km/s/70 km/s/Mpc – the
km/s cancel out to give
5000/70 Mpc = 71 Mpc
•
• Question
7 If you find a metal rich star it is more likely to be a member of which Population?
a.The
Population I (disk). b.The
Population II (halo) c.Either is equally likely.
•Metal rich stars are usually Population I stars found
in the disk.