An electron passing close to a target nucleus slows and radiates away some of its energy. What is the process called?
A. blackbody radiation
B. photoelectric effect
C. stimulated emission
D. bremsstrahlung
E. Compton effect
D. bremsstrahlung
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In a binary system, the more massive star
a. is at the center of mass. b. is farthest from the center of mass. c. is nearest the center of mass. d. follows the largest orbit. e. shows a larger Doppler shift in its spectral lines.
Current in a conductor can be increased by
A) increasing the voltage across it. B) reducing its resistance. C) both of these D) neither of these
A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be
A) equal to the weight of the bucket. B) greater than the weight of the bucket. C) less than the weight of the bucket.
A quantum is a
a. discrete amount. b. fundamental property. c. unit of momentum. d. proton.