In the context of main-sequence stars, which of the following statements is true of a mass-luminosity relation?
A) The main-sequence stars in a Hertzsprung-Russell diagram are not ordered according to their masses.
B) The lowest-mass stars are the hottest and brightest main-sequence stars.
C) It is followed by giants, supergiants, and white dwarfs.
D) The more massive a star is, the more luminous it is.
D
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Chromatic aberration is absent in
A) converging lenses B) diverging lenses. C) front surface plane mirrors.
Resonance occurs in an AC series circuit when which of the following conditions is met?
a. capacitive reactance equals zero b. capacitive reactance equals inductive reactance c. resistance equals capacitive reactance d. resistance equals inductive reactance
What energy must be added or given off in a reaction where a helium atom is separated into two hydrogen atoms and two neutrons? (Atomic masses for each: hydrogen, 1.007825 u; neutron, 1.008665 u; helium, 4.002602 u; also, 1 u = 931.5 MeV/c2.)
a. 28.3 MeV given off c. 20.7 MeV given off b. 20.7 MeV added d. 28.3 MeV added
Which physical property in Laplace's nebular hypothesis could not explain the Sun's slow rotation?
a. angular momentum b. angular diameter c. gravitational pull d. radiation pressure e. electromagnetic energy