What does the moderator do in a nuclear reactor?
a. It is a safety feature that limits the nuclear reaction.
b. It absorbs neutrons.
c. It slows down neutrons.
d. none of the above
c
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In which type or types of radioactive decay does the mass number of the parent nucleus not change?
A) electron capture only B) beta decay only C) alpha decay only D) beta decay and electron capture
The major players in the discovery of the cosmic microwave background were at
A) Kitt Peak and the University of Arizona. B) Bell Labs and Princeton. C) Cal Tech and Mt. Palomar. D) Keck telescopes and the University of Hawaii. E) Jet Propulsion Lab and MIT.
The most energy per unit mass can be extracted from
A) coal. B) petroleum. C) natural gas. D) uranium.
Radioactivity is used in
A. flashlights B. TV screens C. fluorescent lights D. smoke detectors