In radioactive dating, carbon-14 is often used. This nucleus emits a single beta particle when it decays. When this happens, the resulting nucleus is
A) still carbon-14.
B) boron-14.
C) nitrogen-14.
D) carbon-13.
E) carbon-15.
C
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If the density of the universe is greater than critical, then:
A) there is more matter than energy. B) the universe is closed, gravity wins, and will shrink to the Big Crunch. C) the universe is flat, and Euclid is right. D) the Universe will continue expanding forever. E) the universe will end up as nothing but black holes.
The energy required to excite a(n) _________energy electron to the energy of free space is called the work function.
Fill in the blank(s) with the appropriate word(s).
What is the approximate mass-to-light ratio for the inner region of the Milky Way Galaxy, in units of solar masses per solar luminosity?
A) 1000 B) 600 C) 100 D) 6 E) 0.1
Define electrolysis