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Calculate the uncertainty in the energy of the n=2 state of a hydrogen atom if the normal lifetime of the electron in this state is 1.3 x10-8 sec.
Convert the result to electron volt units:
Compare this energy uncertainty with the transition energy from n=2 to n=1 for hydrogen.
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the mass of the star
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