What is TRUE of radio telescopes?
A) They have poorer angular resolution than a refractor.
B) They have better angular resolution than a reflector.
C) They are the smallest, most compact telescopes.
D) They can only be used above the atmosphere.
E) They are most sensitive to the opacity of the ozone layer.
A
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Intensity of Sound: A certain glass window reduces the intensity level of the sound from 72 dB to 47 dB. By what factor is the acoustic power reduced by this glass window?
A. 3.2 × 10-3 B. 2.2 × 10-2 C. 5.6 × 10-2 D. 1.0 × 10-1 E. 1.5 × 10-1
Fusion of degenerate hydrogen on the surface of a white dwarf causes temperatures to reach millions of degrees and the density tens of thousands the density of water releasing enough energy to blow the surface layers, resulting in a(n) _______________
Fill in the blank(s) with correct word
The absence of a magnetic field on Venus probably stems from its:
A) nearness to the Sun. B) extremely thick atmosphere. C) slow rotation. D) high surface temperatures. E) lower density than Earth, suggesting an absence of an iron core.
A certain meteoroid [a rock in space] has been moving through our solar system ever since the solar system was formed, 5 billion years ago. Suppose the meteoroid is far from all planets and stars, so that the effect of gravity is negligible
Neglecting gravity, is any physical work being done on the meteoroid? A) No, because the force of inertia on the meteoroid is balanced by the equal reaction force by the meteroid. B) Yes, because work is always required to move any massive object through a distance. C) No, because no forces are exerted on the meteoroid. D) Yes, because the force of inertia is exerted on the meteoroid while the meteoroid moves. E) Yes, because the meteoroid is moving.