Radiation: If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A. increase by a factor of 3.
B. increase by a factor of 9.
C. increase by a factor of 18.
D. increase by a factor of 27.
E. increase by a factor of 81.
Answer: E
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In the context of blackbody radiation, which of the following statements is true of stars?
A) Temperatures of stars cannot be estimated from their color. B) Red stars are cool, and blue stars are hot. C) Red stars are hot, and blue stars are cool. D) Star temperatures cannot be measured using the relative strengths of various spectral lines.
An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth. B) farthest from the Earth. C) neither of these
What is the shortest wavelength in the Paschen series?
A) 410.2 ?m B) 365 nm C) 820.4 nm D) 410.2 nm E) 820.4 ?m
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?