You do not see your image when you look at a flat rough aluminum surface because of
a. interference.
b. diffraction.
c. specular reflection.
d. diffuse reflection.
e. polarization.
d
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Cepheid variable stars have pulsation periods of _____
A) 1 to 60 days B) 80 to 140 days C) 150 to 210 days D) 230 to 290 days
On this graph, the black curve represents actual temperature measurements, the red curve represents models of the climate that include human emissions of greenhouse gases, and the blue curve represents models of the climate that include only natural factors but do not include human emissions of greenhouse gases. What is the key message that can be read from this graph?
A) Models support the conclusion that human emissions are driving global warming. B) Different climate models give different predictions about how much global warming should be occurring. C) Climate models can successfully reproduce Earth's climate for the first half of the 20th century, but after that, they are unable to account for actual temperature data. D) Although some models support the idea that global warming is caused by human activity, other models do not and the cause therefore remains controversial.
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 310 J E) 126 J
A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. The amount of temperature rise is governed by
a. the first law of thermodynamics b. the second law of thermodynamics c. specific heat capacity d. a heat pump e. none of the above