The temperature of the layer of gas that produces the visible light of the Sun is:
A) 3,500 K.
B) 5,800 K.
C) 12,300 K.
D) 300,000 K.
E) 15 million K.
B
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The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
All Type II supernovae produce neutron stars when they collapse
Indicate whether the statement is true or false
In the Hertzprung—Russell diagram most stars are found
A) on the main sequence B) in the red giant region C) in the white dwarf region D) in the supergiant region
How is the energy that powers radio galaxies, quasars, and other active galactic nuclei produced?
A) by matter that has been converted to pure energy by interacting with the jets shot out by a central black hole B) by nuclear fusion near a central black hole C) by matter-antimatter annihilation near a central black hole D) by magnetic fields that trap and accelerate charged particles, which then radiate large amounts of energy E) by gravity, which converts the potential energy of matter falling toward a central black hole into kinetic energy, which is then converted to thermal energy by collisions among the particles of matter