Two sources emit beams of microwaves. The microwaves from source A have a frequency of 10 GHz, and the ones from source B have a frequency of 20 GHz. This is all we know about the two beams
Which of the following statements about these beams are correct? (There could be more than one correct choice.) A) Beam B carries twice as many photons per second as beam A.
B) A photon in beam B has twice the energy of a photon in beam A.
C) The intensity of beam B is twice as great as the intensity of beam A.
D) A photon in beam B has the same energy as a photon in beam A.
E) None of the above statements are true.
B
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Momentum: A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
A. 1.2 kg ? m/s B. 1.8 kg ? m/s C. 4.4 kg ? m/s D. 5.4 kg ? m/s E. 72 kg ? m/s
The observed relationship of 1/500 between the masses of central black holes and the bulge masses of galaxies implies that
A) the black hole will eventually suck in the rest of the galaxy. B) galaxy formation and supermassive black hole formation must be related somehow. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
The shortest-daylight day for people in the Southern Hemisphere at latitudes greater than 30°S occurs at the
a. summer solstice. b. vernal equinox. c. winter solstice. d. autumnal equinox.
The work done by the centripetal force on an object with a mass of 1 kg moving with a constant velocity of 4 m/s into a circular path of radius 0.6 m for one full cycle is
A) 100.7 J B) 3.8 J C) 0 J D) 40 J E) 80 J