Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass.
B) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects.
C) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass.
D) The question is nonsense; gas temperature cannot possibly tell us anything about mass.
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass.
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The Helix and Egg nebulae which originated from (what are today) white dwarf stars are
a. supernova remnants. b. planetary nebulae. c. the result of uranium detonation. d. the result of the collapse of the iron core of each star. e. nebulae associated with protostars.
The mean free path of molecules in a gas is proportional to:
A. the molecular diameter B. the reciprocal of the molecular diameter C. the molecular concentration D. the reciprocal of the molecular concentration E. the average molecular speed
What is a compound?
A) a group of molecules B) a molecule containing hydrogen C) a molecule containing two or more elements D) an ionized molecule E) a molecule containing carbon
What is the final temperature of the gas?
a. –123 °C b. 150 °C c. 27.6 °C d. –59.3 °C