The two nuclei that can sustain a nuclear chain-reaction are
A) thorium and plutonium.
B) 238U and plutonium.
C) thorium and 235U.
D) 235U and plutonium.
E) Actually, there is only one nucleus that can sustain a nuclear chain-reaction.
D
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A transformer is based on a principle of
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In the figure below the blue object arrow is replaced by one that is much taller than the lens. How many rays from the object will strike the lens?