The naturally-occurring isotope that will sustain a fission chain reaction is
A) tritium, i.e., 3H.
B) 14C.
C) 239Pu.
D) 238U.
E) 235U.
E
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Claims that appear to be pseudoscience should be
A. accepted if it is said to have scientific validity B. tested experimentally C. accepted if promoted by news media D. all of the above
As life on Earth evolved, its DNA
A) changed gradually into RNA B) stayed the same C) became gradually less complex D) became gradually more complex
Discuss the roles that ammonia, hydrogen sulfide, and methane play in the appearances of the jovian planets
What will be an ideal response?
The Higgs field, if it is discovered, is expected to interact with particles in such a way as to give those particles
A) the ability to exert forces. B) electric charge. C) good looks. D) rest mass. E) physical existence.