Question

Which of the following is the energy of a possible excited state of hydrogen?

• A. +13.6 eV
• B. -6.8 eV
• C. -3.4 eV
• D. +6.8 eV

Answer 1

The correct option is C -3.4 eV

$E\propto (-13.6)/n^2$
Keep in mind that n has to be an integer.
Looking at the options, only option C is a possible answer with the 'n' value of 2.