The energy required to knock out the electron in the third orbit of a – McqOptions

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1.	The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to [DPMT 1987]
A.	\[13.6\ eV\]
B.	\[+\frac{13.6}{9}eV\]
C.	\[-\frac{13.6}{3}eV\]
D.	\[-\frac{3}{13.6}eV\]
Answer» C. \[-\frac{13.6}{3}eV\]

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