The core of the reactor at Three Mile Island
A) never had a significant chance of a meltdown.
B) came within a day of a melt-down.
C) came within seconds of a melt-down.
D) came within an hour of a melt-down.
E) melted down.
E
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A nova is almost always associated with
a. a very massive star. b. a very young star. c. a star undergoing helium flash. d. a white dwarf in a close binary system. e. a solar like star that has exhausted its hydrogen and helium.
Mass is a vector quantity
Indicate whether the statement is true or false
The element erupting from the volcanoes of Io is ________
Fill in the blank(s) with correct word
The energy of a photon that ionizes a hydrogen atom from the ground state will be _________ the energy of a photon that ionizes a different hydrogen atom from the first excited state (n – 2)
a. larger than b. smaller than c. equal to d. twice