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
Physics & Space Science
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Complete the following decay. 
A. n
B. 
C. 
D. 
E. 
Physics & Space Science
Over geological time periods, the Earth's climate has been
A) relatively stable B) continuously unstable C) constant and unchanging D) gradually becoming more unstable
Physics & Space Science
Amy, Brad, and Cate are walking (or running) along a straight line as shown below
A copper and an aluminum part are bolted together as shown. Estimate the rate of diffusion of copper into the aluminum if the copper mass fraction is 0.1% at 2 mm into the aluminum at a particular time, and the diffusivity is the same as that at 500ºC.
Physics & Space Science