An amount of fissionable material that will not sustain a chain reaction is called
a. a subatomic mass.
b. a subisotopic mass.
c. a subcritical mass.
d. none of these.
c
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Isotopic analysis of a rock can tell us
A) what the rock is made of B) the detailed geological history of the rock C) the temperature and pressure conditions under which it formed D) when the rock formed
A 34-kg child on an 18-kg swing set swings back and forth through small angles
If the length of the very light supporting cables for the swing is how long does it take for each complete back-and-forth swing? Assume that the child and swing set are very small compared to the length of the cables. A) 4.4 s B) 4.8 s C) 5.3 s D) 5.7 s
What is the composition of minerals?
Spectral lines for an element are often in the
A) infrared region. B) ultraviolet region. C) both of these D) neither of these