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An element’s is its row in the periodic table.
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Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?
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Could we see a galaxy that is 20 billion light-years away?
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Estimate of the number of stars in our galaxy
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An element’s is its row in the periodic table....
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