You will see that the Universe is almost 14 billion years old. That means that we see the most distant galaxies as they were when the Universe was:
A.) A few thousand years old.
B.) 1-2 million years old.
C.) 1-2 billion years old.
D.) 4-6 billion years old.
E.) 13 billion years old.
Ans: C.) 1-2 billion years old.
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A type-II supernova
a. occurs when a white dwarf's mass exceeds the Chandrasekhar limit. b. is the result of helium flash. c. is characterized by a spectrum that shows hydrogen lines. d. occurs when the iron core of a massive star collapses. e. c and d
How much charge must pass by a point in 20 s for the current to be 0.10 A?
A) 200 C B) 50 C C) 2.0 C D) 0.005 C
A person who can clearly see nearby objects but not distant ones is ______________
Fill in the blank(s) with correct word
When a hydrogen atom's electron goes from an energy state of n = 1 to n = 3,
a. the radius of the electron's orbit is unchanged. b. the radius of the electron's orbit is increased. c. the radius of the electron's orbit is decreased. d. the radius of the electron's orbit is infinite.