In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00 × 108 m/s,
Wien displacement law constant equals 2.90 × 10-3 m ? K,
? = 5.670 × 10-8 W/m2 ? K4)
A) 1.0 × 1014 Hz
B) 8.0 × 1014 Hz
C) 2.3 × 1014 Hz
D) 6.7 × 1014 Hz
E) 4.1 × 1014 Hz
A
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A) a red giant B) a main-sequence star C) a helium core-fusion star D) a main-sequence star in a binary star system
Which type of curve would accurately represent a closed orbit?
a. ellipse b. hyperbola c. parabola d. straight line
Case 1: An electron is released from rest in a uniform electric field. Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1 . How does the electric potential energy of the charge-field system behave in these cases?
a. In both cases, the potential energy increases. b. In both cases, the potential energy decreases. c. In case 1 the potential energy increases, but in case 2 it decreases. d. In case 1 the potential energy decreases, but in case 2 it increases.
Sunburns are produced by
A) infrared light. B) visible light. C) ultraviolet light. D) all of the above E) none of the above