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Question
An electromagnetic wave is transporting energy in the negative ydirection. At one point and one instant the magnetic field is in the positive xdirection. The electric field at that point and instant is:A) positive ydirection
B) negative ydirection
C) positive zdirection
D) negative zdirection
E) negative xdirection
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
Q:
The velocities of distant objects in the universe indicate that the time elapsed since the big bang is about:
A) 105y
B) 1010y
C) 1015y
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Q:
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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:
Any meson is a combination of:
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C) one quark and two antiquarks
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Q:
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C) all strongly interacting particles
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Q:
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Q:
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Q:
Strangeness is conserved in:
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E) some strong particle decays
Q:
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Q:
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A) a proton
B) an omega minus
C) a sigma
D) an antiparticle
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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
C) the electromagnetic and gravitational forces only
D) the electromagnetic, gravitational, and weak forces only
E) the electromagnetic, gravitational, and strong forces only
Q:
An example of a fermion is a:
A) photon
B) pion
C) neutrino
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Q:
A particle with spin angular momentum is called a:A) leptonB) hadronC) fermionD) bosonE) electron
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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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
E) neutrons
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
C) absorb dangerous gamma radiation
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Q:
In the normal operation of a nuclear reactor:
A) control rods are adjusted so the reactor is subcritical
B) control rods are adjusted so the reactor is critical
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D) the moderating fluid is continually recycled
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Q:
The energy supplied by a thermal neutron in a fission event is essentially its:
A) excitation energy
B) binding energy
C) kinetic energy
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E) electric potential energy
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:
Rank the following collections of particles according to the total binding energy of all the particles in each collection, least to greatest. collection 1: 244Pu (Z = 94) nucleus alone collection 2: 240U (Z = 92) nucleus, particle collection 3: 240U (Z = 92) nucleus, two separated protons, two separated neutronsA) 1,2,3B) 3,2,1C) 2,1,3D) 1,3,2E) 2,3,1
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)