A telescope's resolving power measures its ability to see
A. fainter sources.
B. finer details in sources.
C. larger sources.
D. more distant sources.
Answer: B
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What do we mean when we say that the rotation curve for the Milky Way Galaxy is "flat"?
A) Gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward. B) The amount of light emitted by stars at different distances is about the same throughout the galaxy. C) The disk of a spiral galaxy is quite flat rather than spherical like the halo. D) All the galaxy's mass is concentrated in its flat, gaseous disk.
At the equator during the equinoxes on Uranus a day lasts:
A) 7 hours. B) 8 hours. C) 21 years. D) 42 years. E) 84 years.
All three circuits below have R = 100 ?, C = 1.0 mF, and emf ? = (5.0 V) sin (377 t). The inductors in (B) and (C) are placed sufficiently far apart so that they do not alter one another's inductance. Such inductors add combine like resistors. Which statement regarding the angular resonance frequencies ?A, ?B, and
?C is correct?
?
?
a.
?C > ?A = ?B
b.
?C < ?A = ?B
c.
?A = ?B = ?C
d.
?B < ?A = ?C
e.
?B > ?A = ?C
A ray of light traveling in a calm pond strikes the surface at an angle of incidence which is 2° larger than the critical angle. This ray will
A. be refracted toward the normal to the surface in the air. B. undergo total internal reflection and not enter the air at all. C. be refracted away from the normal to the surface in the air.