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Question
An electron moves from point ito pointf,in the direction of a uniform electric field. During this motion:
A) the work done by the field is positive and the potential energy of the electron-field system increases
B) the work done by the field is negative and the potential energy of the electron-field system increases
C) the work done by the field is positive and the potential energy of the electron-field system decreases
D) the work done by the field is negative and the potential energy of the electron-field system decreases
E) the work done by the field is positive and the potential energy of the electron-field system does not change
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
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D) is proportional to the square of the distance from us
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Any meson is a combination of:
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B) two quarks and an antiquark
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D) one quark and one antiquark
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Q:
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Q:
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Q:
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B) an omega minus
C) a sigma
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Q:
A neutral lepton cannot decay into two neutrinos. Of the following conservation laws, which would be violated if it did?
A) Energy
B) Baryon number
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Q:
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Q:
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A) photon
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C) neutrino
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Q:
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B) quarks
C) gluons
D) neutrinos
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Q:
Compared to fusion in a tokamak, laser fusion makes use of:
A) smaller particle number densities
B) greater particle number densities
C) longer confinement times
D) higher temperatures
E) lower temperatures
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:
Q:
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
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Q:
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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:
A) 214Po (Z= 84)
B) 210Pb (Z= 82)
C) 214At (Z= 85)
D) 218Po (Z= 84)
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Q:
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Q:
Bombardment of 28Si (Z= 14) with alpha particles may produce:
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B) hydrogen and 32S (Z= 16)
C) a deuteron and 27Al (Z= 13)
D) helium and 31P (Z= 15)
E) 35Cl (Z= 17)