What happens to light passing through even thin clouds of dust?
A) The light that passes through them is blueshifted due to the cloud's approach.
B) Its motion causes all light to be redshifted as it passes through these clouds.
C) Its motion causes the light of stars beyond to twinkle.
D) Even a little can completely block all light, such as the Horsehead Nebula.
E) It dims and reddens the light of all more distant stars.
E
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You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
A) The net force acting on the object is zero. B) No forces of any kind are acting on the object. C) The only force acting on the object is gravity. D) The only force acting on the object is air resistance. E) Some unseen force must be keeping the object in motion.
What is the leading evidence for dark energy?
a. That the universe is expanding. b. That dark matter is not affected by conventional energy. c. That ordinary energy must have a complement. d. That the rate of expansion of the universe is increasing. e. The expansion of the universe is slowing down and could eventually reverse.
Observational evidence indicates that at least some gamma ray bursts are produced by
A) the supernovas of very massive stars that leave behind black holes. B) the central black hole of the Milky Way Galaxy. C) the same types of close binary systems that produce x-ray bursts. D) white dwarf supernovas in distant galaxies.
When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases b. decreases c. stays the same d. becomes more quantized e. becomes less quantized