When a gamma ray is emitted from an unstable nucleus,
A)
the number of neutrons and the number of protons drop by two.
B)
the number of neutrons drops by one and the number of protons increases by one.
C)
the number of protons drops by one and the number of neutrons increases by one.
D)
there is no change in either the number of neutrons or the number of protons.
E)
none of the given answers
D
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A. it stays the same B. it doubles C. it quadruples D. it halves E. it quarters
Factors that increase ocean salinity are
A) runoff from streams and rivers. B) formation of sea ice. C) precipitation. D) glacial melting.
If we compress the entire history of the into one year, each day represents
A) about a billion years B) a few tens of millions of years C) a few hundred years D) a few million years
The average distance from Earth to the Sun is
a. 1 ly. b. 1 million km. c. 1 million miles. d. 1 billion km. e. 1 AU.