Wavelength of the photon in nm
An atom has an electron with energy -9.00E-19 J. It absorbs a photon and moves to a new level with energy -4.00E-19 J. What is the wavelength of the photon in nm?
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How many energy levels are present in the 3s conduction band of a single crystal of sodium weighing 26.8 mg? How many electrons are present in this band?
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Calculate the mass of HCl that is neutralized by 2 g of Mg(OH)2(s)
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