List at least three qualities that would tend to make a type of astronomical object useful as a standard candle
What will be an ideal response?
Answers will vary, but some of the key properties of good standard candles include little statistical scatter in brightness; high luminosity, so they can be seen at a great distance; and relative commonness, so they can be found in many objects.
You might also like to view...
At what frequency is the reactance of a 20.0-mH inductor equal to 120 ??
A) 318 Hz B) 637 Hz C) 796 Hz D) 955 Hz E) 1110 Hz
If a baseball were scaled up to the size of planet Earth, each of its atoms would be about the size of
A) a baseball stadium. B) a flea. C) an atom. D) a ping-pong ball.
What would prevent free convection at very low Grashof numbers in an enclosed space?
What will be an ideal response?
Two cars start at the same point, but travel in opposite directions on a circular path of radius R, each at speed v. While each car travels a distance less than 
, one quarter circle, the center of mass of the two cars
A. remains at the initial point. B. travels along a diameter of the circle at speed v' v. E. remains at the center of the circle.