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Question
The intensity of a light beam with a wavelength of 500 nm is 2000 W/m2. The photon flux is about:
A) 5 x1017/m2.s
B) 5 x1019/m2.s
C) 5 x1021/m2.s
D) 5 x1023/m2.s
E) 5 x1025/m2.s
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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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:
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A) Energy
B) Baryon number
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Q:
An electron participates in:
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B) the strong and weak forces only
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Q:
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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
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E) high number density nand temperature T = 0 K
Q:
The first step of the proton-proton cycle is:
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A) hydrogen
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Q:
The purpose of a moderator in a nuclear reactor is to:
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Q:
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Q:
Radioactive polonium, 214Po (Z= 84), decays by alpha emission to:
A) 214Po (Z= 84)
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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