An important feature of the Carnot cycle is that
A) its efficiency can be 100%.
B) its efficiency depends only on the absolute temperature of the hot reservoir used.
C) its efficiency is determined by the temperatures of the hot and cold reservoirs between which it works and by the properties of the working substance used, and on nothing else.
D) it is an example of an irreversible process that can be analyzed exactly without approximations.
E) no engine can be more efficient than a Carnot engine operating between the same two temperatures.
E
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Which of the following is true of Venus?
A) It has polar caps of solid water. B) It is 50 percent the size of planet Earth. C) It is the fourth largest planet of the Solar System. D) It has a thick cloudy atmosphere that hides its surface from view.
How much heat is necessary to change 20 g of ice at –10°C into water at 20°C?
Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature
a. True b. False Indicate whether the statement is true or false
Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum?
A) The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe. B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum. C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum. D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum. E) It doesn't predict that the cosmic background radiation should have a perfect thermal radiation spectrum.