Silicates are minerals composed of silicon and oxygen.
Answer the following statement true (T) or false (F)
True
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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.
The element potassium should produce compounds most similar to those of
a. Tc. b. Na. c. Al. d. Sr.
The ideal gas model assumes that molecules have infinitesimal size. Consider one molecule bouncing around in the container. As the molecule’s size increases relative to the size of the container, how will the average pressure P that it exerts change, other things being held constant?
A. P increases. B. P does not change. C. P decreases. D. One does not have enough information to say.
Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's ______________
Fill in the blank(s) with correct word