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Question
A convex spherical mirror has a focal length of 12 cm. If an object is placed 6 cm in front of it the image position is:A) 4 cm behind the mirror
B) 4 cm in front of the mirror
C) 12 cm behind the mirror
D) 12 cm in front of the mirror
E) at infinity
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:
A) is greatest in directions toward the center of the galaxy
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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The velocities of distant objects in the universe indicate that the time elapsed since the big bang is about:
A) 105y
B) 1010y
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Q:
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C) one quark and two antiquarks
D) one quark and one antiquark
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Q:
Any meson is a combination of:
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Q:
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Q:
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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
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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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A) smaller particle number densities
B) greater particle number densities
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D) higher temperatures
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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:
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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In the normal operation of a nuclear reactor:
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The energy supplied by a thermal neutron in a fission event is essentially its:
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C) kinetic energy
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When 236U fissions the fragments are:
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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:
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)