As the intensity of light is increased in a photoelectric effect experiment, the energy of the emitted electrons increases
Indicate whether the statement is true or false
F
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A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be
A) more than 28 days. B) unchanged at 28 days. C) less than 28 days.
If an electric field is applied to a metal
a. very few electrons are excited into the conduction band. b. electrons having energies near the Fermi energy require only a small amount of additional energy from the applied field to reach nearby empty energy states. c. electrons having energies near the bottom of the band require only a small amount of additional energy from the applied field to reach nearby empty energy states. d. the principal mode of conduction is through the motion of holes in the filled part of the band. e. the Fermi energy Ef becomes equal to the applied electric field E.
Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass. B) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects. C) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass. D) The question is nonsense; gas temperature cannot possibly tell us anything about mass.
A certain transformer doubles input voltage. If the primary coil draws 10 A of current, then the current in the secondary coil is
A) 2 A. B) 5 A. C) 10 A. D) 25 A. E) none of the above