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The electron energy in hydrogen atom is given by En = (2.18 1018)/n 2 J. Calculate the energy required to remove an electron completely

The electron energy in hydrogen atom is given by En = (–2.18 × 10–18)/n2 J. Calculate the energy required to remove an electron completely from the n = 2 orbit. What is the longest wavelength of light in m that can be used to cause this transition?

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