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In a hydrogen atom, the electron and proton are bound at a distance of about $0.53 \mathring {A}$What is the minimum work required to free the electron, given that its kinetic energy in the orbit is half the magnitude of potential energy obtained in (a)?

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$(B) 13.6 eV$
Hence B is the correct answer
answered Jun 23, 2014 by meena.p
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