When thorium (A = 90) emits a beta particle, the resulting nucleus has atomic number

A) 88.
B) 89.
C) 90.
D) 92.
E) none of the above


Answer: E

Physics & Space Science

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What does this graph tell us about humans compared to other animals?

A) Humans have a brain that is unusually large for an animal of our size. B) Humans have the largest brains of any animal. C) Unlike the brains of other animals, human brains cannot be described by a straight line. D) Based on averages determined from other animals, human brains are precisely the size we'd expect for animals of our weight.

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The first self-sustaining nuclear fission reaction was achieved in Chicago in 1942 under the direction of a scientist named ______________

Fill in the blank(s) with correct word

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The three sources that brought young Earth to its melting point were

A) impact heating, convection heating, radiometric heating. B) impact heating, gravitational contraction heating, radioactive decay heating. C) impact heating, convection heating, radioactive decay heating. D) collisional heating, contraction heating, radiometric heating.

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Compared to a clock at the bottom of a very tall skyscraper, a clock at the top of this skyscraper will appear to run

A) slower. B) faster. C) the same.

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