For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. If the Kelvin
temperature of a body is doubled, the wavelength of the most intense light is ____________ the wavelength originally of the most intense light.
a. 1/16th
b. half
c. the same as
d. 2 times
e. 16 times
b
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Precession of the rotation axis of Earth takes ____ to complete a cycle
a. 24 hours b. one year c. 260 years d. 26,000 years e. 260,000 years
Willis thinks over the discussion of the second part of the first experiment described on pages 30-31 . He is interested in the equality of the force he exerts on the clone and the one the clone exerts on him
Later he tells his girlfriend Sheena "It may be right in that case, because both people had the same mass. It's wrong if the masses are different. If I met the Hulk and he pushed me, it would be with a greater force than I could use to push him back." Discuss this reasoning.
A person weighting 700 N stands in the middle of an otherwise empty 4 m x 5 m x 3 m room. How does the weight of the person compare with the weight of the air (the density of air is 1.29 kg/m3 ) in the room?
A) The weight of the air is much more than the weight of the person. B) The weight of the air is about the same as the weight of the person. C) The weight of the air is much less than the weight of the person. D) It makes no sense to speak of weight for a gas like air.
What's wrong with the statement "heat rises?"
a. Nothing—heat does rise. b. One should say "energy rises.". c. One should say "heated air (or other fluid) rises.". d. none of the above