Which of the following would be the best radiator of thermal energy?
A) a shiny surface
B) a perfectly white surface
C) a perfectly black surface
D) a metallic surface
E) styrofoam
C
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The fact that we always see the same face of the Moon tells us that:
A. The Moon does not rotate B. The Moon's rotation period is the same as its orbital period. C. The Moon looks the same on both sides. D. The far side of the Moon is always dark.
Assume electrons are accelerated through a potential difference of 25000 V inside a TV picture tube. What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10?10 m)
a. 0.50 Å b. 1.0 Å c. 10 Å d. 100 Å e. 0.25 Å
One end of resistor A is connected to the positive terminal of a battery and the other end is connected to resistor B. The opposite end of resistor B is connected to the negative terminal of the battery. If resistor A has resistance R and B has a resistance 2R, what is the equivalent resistance of this circuit?
a) R b) 3R/2 c) 2R d) 2R/3 e) 3R
In a metal that is not a superconductor, as the temperature approaches 0 K the electrical resistivity is due to free-electron scattering by:
(a) Structural defects (b) Thermal vibrations (c) Core electrons (d) Nuclei