If the magnitude difference between one star and another is 1, the stars differ in brightness by a factor of
a. 10.
b. 100.
c. 2.51.
d. 4.
c
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Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that signify active star formation. B) They are moving slower than stars in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black.
The H-R diagram can plot
A) apparent magnitude versus spectral classes. B) radius versus luminosity. C) radius versus mass. D) temperature versus luminosity. E) temperature versus mass.
Two rods of the same length and diameter are made from different materials. The rods are to connect two regions of different temperature so that energy will transfer through the rods by heat. They can be connected in series, as in figure a, or in parallel, as in figure b. In which case is the rate of energy transfer by heat larger?
Energy transport by ____________________ is important when photons cannot readily travel through a gas
Fill in the blank(s) with correct word