Diagram 6-2 illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see a continuous spectrum?
a.
1
b.
2
c.
3
d.
2 and 3
e.
none of them
A
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What makes dark matter and dark energy so mysterious and so important?
A. We don't exactly know what they are, but they are the determining factors of the stellar evolution and planet formation. B. We don't have strong evidence that they exist, but they could influence the motion of stars in Milky Way Galaxy. C. We don't exactly know what they are, and they make up the majority of the total energy content of the universe. D. We don't have strong evidence that they exist, and they could strongly influence the processes occurring in our Solar System.
Which of the following particles are leptons?
a. Mesons and baryons. b. Mesons and neutrinos. c. Electrons and neutrinos. d. Muons and baryons. e. Tau and mesons.
Light consisting of a mixture of red and blue light enters a 40°, 70°, 70° prism along a line parallel to the side opposite the 40° vertex. The index of refraction of the prism material for blue light is 1.530,
and for red light it is 1.525. What is the angle between the two emerging beams of light? A) 0.5° B) 0.9° C) 0.1° D) 0.3° E) 0.7°
The stability of a bicycle is due to angular momentum of the wheels when the bicycle is moving forward. The stability is due to the net angular momentum vector, which
A. points upward, perpendicular to the surface of Earth, thereby canceling the weight of the bicycle and rider. B. points to the rider's left. C. is actually zero, since the back wheel cancels the angular momentum of the front wheel. D. increases when the bicycle slows down due to conservation of energy.