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Question
A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is:A) 10 W/m2
B) 1.6 W/m2
C) 1.0 W/m2
D) 0.080 W/m2
E) 0.024W/m2
Answer
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Related questions
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D) is proportional to the square of the distance from us
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D) one quark and one antiquark
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Any meson is a combination of:
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Q:
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Q:
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A) Energy
B) Baryon number
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Q:
An electron participates in:
A) the electromagnetic and weak forces only
B) the strong and weak forces only
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Q:
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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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For a controlled nuclear fusion reaction, one needs:
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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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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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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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B) 210Pb (Z= 82)
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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B) hydrogen and 32S (Z= 16)
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