Question

Which of the following corresponds to the energy of the possible excited state of hydrogen?

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

Answer 1

Answer: (C)

The different energy levels of an atoms are given by the equation. $E_n=-13.6Z^2/n^{2}eV$ $Z$ is the atomic number for hydrogen
$=1$ $n=1,2,3$ and so on such that the ground state has
$n=1$ and the secondary energy level (first excited state)
has $n=2$
So, for first excited state, $n=2$
$E=-13.6/2^2=-13.6/4=-3.4eV$