Why would you expect alpha particles to be less able to penetrate materials than beta particles of the same kinetic energy?
A. Alpha particles carry twice the electric charge.
B. Alpha particles pick up electrons to become harmless helium atoms.
C. Alpha particles move much slower for a given kinetic energy.
D. Two of the above answers are reasonable.
Answer: D
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Indicate whether this statement is true or false
The salinity of seawater remains constant because
A. salinity measurement technology is unreliable. B. salts are removed from seawater about as fast as they are deposited. C. salts are included in the molecular formula of seawater. D. salts no longer form in the ocean.
Earth’s human population reached ____________________ in 2011 and is prjected to be
____________________ in 2045. Fill in the blank(s) with the appropriate word(s).
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