In radioactive decay, the original nucleus before decay is referred to as the
A) daughter isotope
B) parent isotope
C) mother-in-law isotope
D) progenitor isotope
B
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The condensation theory is an example of:
A) a catastrophic theory. B) a hot Jupiter theory. C) a collision hypothesis. D) an evolutionary theory. E) a capture theory.
The radial distance to the event horizon from the singularity of a black hole is called
a. the Roche limit. b. the Schwarzschild radius. c. the Hubble unit. d. none of the above.
The planet(s) of our solar system that are usually or never visible to the naked eye are
a. Mars. b. Mercury and Neptune. c. Saturn, Uranus, and Neptune. d. Uranus and Neptune. e. Mercury and Venus.
A solid metal sphere of radius r is inside a metal concentric spherical shell of inner radius 2r and outer radius 3r. A charge is place on the solid metal sphere and it is found that the potential at its surface is V1 (at r) and that the potential at
the outer surface of the spherical shell is V3 (at 3r). In terms of V1 and V3, what is the potential at the inner surface of the metal shell (at 2r)? a. 3V1/2 b. V3 c. V1 d. 2V3/2