An electron in a hydrogen like atom is in an excited state. It has a total energy of, - 3.4 eV. Calculate the kinetic energy of electron?
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An electron in a hydrogen-like atom is in an excited state. It has a total energy of -3.4 eV. How can I calculate the kinetic energy of the electron?
+3.4
Kinetic energy in this case is negative of total energy.
-(-3.4)=+3.4 ( remember, kinetic energy is never negative.)
The potential energy is double of total enegy so, it is -6.8.
Total energy comes out to be same as the question: 3.4-6.8= -3.4
Only if electron is associated with the atom, then this concept is applied, if the electron is free, then total energy will be positive and will be in the form of kinetic energy only.
Hope now it's clear:).
+3.4
Kinetic energy in this case is negative of total energy.
-(-3.4)=+3.4 ( remember, kinetic energy is never negative.)
The potential energy is double of total enegy so, it is -6.8.
Total energy comes out to be same as the question: 3.4-6.8= -3.4
Only if electron is associated with the atom, then this concept is applied, if the electron is free, then total energy will be positive and will be in the form of kinetic energy only.
Hope now it's clear:).
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