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Question
What was the most convincing evidence that a natural nuclear reactor formed two billion years ago in a uranium deposit in Africa?A) the relative depletion of 235U in the deposit
B) the relative depletion of 238U in the deposit
C) the relative abundance of lead in the deposit
D) the isotopic distribution of neodymium in the deposit
E) the appearance of radiation damage in the surrounding rock
Answer
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Related questions
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The intensity of the microwave background radiation, a remnant of the big bang:
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B) is least in directions toward the center of the galaxy
C) is proportional to the reciprocal of the distance from us
D) is proportional to the square of the distance from us
E) is nearly the same in all directions
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Any meson is a combination of:
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Q:
An electron participates in:
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A) photon
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C) neutrino
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B) greater particle number densities
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Q:
For a controlled nuclear fusion reaction, one needs:
A) high number density nand high temperature T
B) high number density nand low temperatureT
C) low number density nand high temperature T
D) low number density nand low temperature T
E) high number density nand temperature T = 0 K
Q:
The first step of the proton-proton cycle is:
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Nuclear fusion in the Sun is increasing its supply of:
A) hydrogen
B) helium
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Q:
The purpose of a moderator in a nuclear reactor is to:
A) provide neutrons for the fission process
B) slow down fast neutrons to increase the probability of capture by uranium
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The energy supplied by a thermal neutron in a fission event is essentially its:
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Q:
A certain nucleus, after absorbing a neutron, emits a and then splits into two alpha particles. The (A, Z) of the original nucleus must have been:A) 6, 2B) 6, 3C) 7, 2D) 7, 3E) 8, 4
Q:
Radioactive polonium, 214Po (Z= 84), decays by alpha emission to:
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C) 214At (Z= 85)
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Q:
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Q:
Bombardment of 28Si (Z= 14) with alpha particles may produce:
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C) a deuteron and 27Al (Z= 13)
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