The total energy of an electron in the first excited state of hydrogen is about \[-3.4\text{ }eV\]. Its kinetic energy in this state is: [AIPMT (S) 2005]
A) \[-3.4\text{ }eV\]
B) \[-6.8\,eV\]
C) \[6.8\text{ }eV\]
D) \[3.4\text{ }eV\]
Correct Answer:
C
Solution :
Key Idea: The kinetic energy is equal to the negative of total energy.