Nuclear Fission and Fusion: What is the meaning of the term "critical mass" in regard to nuclear fission?
A. This is the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium.
B. This is the minimum amount of fissionable material required to sustain a chain reaction.
C. This is the amount of mass needed to make a power reactor economically feasible.
D. This is the amount of material that is just on the verge of becoming radioactive.
Answer: B
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One phenomenon that demonstrates the wave nature of light is:
a. the photoelectric effect. b. quantization effects. c. absorption of light by an electron. d. interference effects.
The first law of thermodynamics can be given as
A hollow circular post ABC (see figure) supports a load P1 5 16 kN actat the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB 5 30 mm, tAB 5 12 mm, dBC 5 60 mm, and tBC 5 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
a protostar evolves by contracting and condensing in order to become?
What will be an ideal response?