Total energy of an electron in first orbit of hydrogen atom is -13.6ev .The kinetic energy in the same orbit will be
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The kinetic energy will be same as that of Total energy but with positive sign becuase Kinetic energy cannot be negative...
A potential energy for the same orbit will be twice the Total energy with negative sign...
As Total energy = Kinectic enegy + Potential energy...
Thus Kinetic energy will be 13.6 eV
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