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
A) self inductance. B) direct current. C) alternating current. D) mutual inductance. E) energy conservation.
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?
Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) spectroscopy (taking a spectrum) B) imaging (taking a picture) C) time monitoring (measuring how the amount of light changes with time)
The energy required to accelerate an interstellar spaceship depends on
A) its mass only B) its final velocity only C) the type of fuel it uses D) its mass and final velocity