Why do we expect the cosmic background radiation to be almost, but not quite, the same in all directions?
A) The overall structure of the universe is very uniform, but the universe must have contained some regions of higher density in order for galaxies to form.
B) The temperature of the universe can be found by taking an average over the entire sky, but individual stars will create peaks in the spectrum over small angles.
C) Dark matter consisting of WIMPs greatly smooths out the spectrum, but the small patches of "light" matter create peaks in the spectrum.
D) The overall structure of the universe is very uniform, but the synthesis of different elements produces varying signatures within the background spectrum.
E) The overall structure of the universe is very uniform, but intervening gas between us and the era of nuclei absorbs wavelengths depending on the composition and redshift of the gas.
A
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What are oxidation reactions?
A) reactions that produce oxygen atoms B) reactions that destroy oxygen atoms C) reactions that remove oxygen from the atmosphere, such as fire and rust D) reactions that convert CO2 to O2 E) all of the above, i.e., any reaction involving oxygen
In which system is heat usually transferred from the cooler part to the warmer part?
a. a stove as it heats up water b. a refrigerator that is running c. an electric fan that is running d. none of the above, because it is impossible to transfer heat in this manner
Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm B) 20 N/m C) 200 N/m D) 2000 N/cm E) 0.0020 N/m
What is the limiting angle of resolution, in degrees, for a microscope with an objective 0.50 cm in diameter when viewing is done at 590 nm?
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E. 