What is the fate of an open universe?
a. Expansion forever
b. Eventual collapse
c. Gradual halt to the expansion
d. Can't be known without density information.
D
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How many grams of ethanol (specific gravity 0.80 ) should be added to 5 grams of chloroform (specific gravity 1.50 ) if the resulting mixture is to have a specific gravity of 1.20?
A) 2.0 gms B) 2.4 gms C) 1.8 gms D) 4.4 gms E) 1.6 gms
A pattern of bright lines on a dark background is referred to as
A) an emission line spectrum B) an absorption line spectrum C) a continuous spectrum D) a bright spectrum
The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that ________
A) the black hole will eventually suck in the rest of the galaxy B) galaxy formation and supermassive black hole formation must be related somehow C) quasars were more common 10 billion years ago than they are today D) the biggest galaxies have the most luminous quasars
Radio telescopes are _____
A) reflecting telescopes B) refracting telescopes C) infrared telescopes D) optical telescopes