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To calculate the kinetic energy of electron , we can first find it's speed to determine if we have to use relativistic or non-relativistic relations. From (4) we have
Although speed of electron is very high (for our standards), it is very small compared to speed of light. Therefore, all our non-relativistic calculations are justified. Kinetic energy of electron (in state ) is
State of the hydrogen atom: ,
We need to calculate the kinetic energy of the electron .
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