When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its frequency
A) is unaffected.
B) is reduced to 2/3 its original value.
C) increases by a factor of 3/2.
A
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The internal structure of the Earth is investigated mainly by
A) studying seismic waves generated from earthquakes B) deep drilling C) remote sensing satellites D) measuring changes in the Earth's magnetic field
Density is
A) proportional to both mass and volume. B) proportional to mass and inversely proportional to volume. C) inversely proportional to mass and proportional to volume. D) inversely proportional to both mass and volume. E) proportional only to volume.
What is the initial direction of the magnetic force acting on the particle in each case?
A. Forward
B. Backward
C. Rightward
D. Leftward
E. Into the paper
F. Out of the paper
T. (Zero force)
What evidence has Chandra found to contradict the hypothesis that black holes merge during galaxy collisions?
A) a double black hole in a single galaxy B) a black hole without a host galaxy C) a hypermassive black hole D) a triple black hole system E) a dwarf galaxy containing a black hole