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In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?
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Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match
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If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?
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The height of the empire state building is 318 m if a stone is dropped from the top of the building what is the stones velocity just before it strikes the ground
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