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Question
Yellow light is viewed by reflection from a thin vertical soap film. Let 
be the wavelength of the light within the film. Why is there a large dark space at the top of the film?
A) no light is transmitted through this part of the film
B) the film thickness there is /4
C) the light reflected from exactly one of the two surfaces undergoes a 180ï‚°phase change
D) the film is too thick in this region for thin film formulas to apply
E) the reflected light is in the infrared
Answer
This answer is hidden. It contains 1 characters.
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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A) 105y
B) 1010y
C) 1015y
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Q:
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Q:
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Q:
Any meson is a combination of:
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B) two quarks and an antiquark
C) one quark and two antiquarks
D) one quark and one antiquark
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Q:
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C) all strongly interacting particles
D) only strange particles
E) only mesons
Q:
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Q:
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Q:
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A) baryon
B) lepton
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Q:
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A) a proton
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
C) Linear Momentum
D) Angular momentum
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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
B) pion
C) neutrino
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Q:
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Q:
The microwave background radiation is a result of the big bang. The big bang also resulted in a uniform distribution of background:
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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
C) nucleons
D) positrons
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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:
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B) control rods are adjusted so the reactor is critical
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Q:
The energy supplied by a thermal neutron in a fission event is essentially its:
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B) binding energy
C) kinetic energy
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Q:
When 236U fissions the fragments are:
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B) always identical
C) never 140Xe and 94Sr
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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)
E) 210Bi (Z= 83)
Q:
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Q:
Bombardment of 28Si (Z= 14) with alpha particles may produce:
A) a proton and 31P (Z= 15)
B) hydrogen and 32S (Z= 16)
C) a deuteron and 27Al (Z= 13)
D) helium and 31P (Z= 15)
E) 35Cl (Z= 17)