Atomic StructureMedium

Question

The total energy of the electron in the first excited state of hydrogen is − 3.4 eV. What is the kinetic energy of the electron in this state ? 

Options

A.+ 1.7 eV
B.+ 1.7 eV
C.+ 6.8 eV
D.− 13.4 eV 

Solution

In quantum state of a bohr atom     −T.E = KE
−(−3.4) = KE
3.4 ev = KE

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