The Fermi temperature of copper is 80 000 K. The corresponding Fermi energy (in eV) is
a. 7
b. 5
c. 3
d. 1
e. 4
a
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Nuclear Binding Energy: Uranium-238 decays into thorium-234 plus an alpha particle. The known masses are
How much energy is released in this process? (1 u = 931.5 MeV/c2)
A. 4.28 MeV B. 3.76 MeV C. 3.18 MeV D. 2.89 MeV E. 5.05 MeV
The critical density of the universe is the
A) total density of matter and energy needed to give the universe a "flat" geometry (in spacetime). B) measured average density of matter in the universe. C) density of matter necessary for stars and galaxies to form. D) density value at which the total density of matter precisely equals the total density of antimatter.
Where are the X-rays produced that are emitted by quasars and other active galactic nuclei?
A) in the hot gas in an accretion disk around a central black hole B) in dust grains in molecular clouds that encircle the active galactic nucleus C) in an ionization nebulae of interstellar gas surrounding the accretion disk D) in fast-moving jets of electrons that are ejected from the active galactic nucleus E) all of the above
The boundary between two air masses is called a
a. squall line. b. blizzard. c. tornado. d. front.