Question

The amount of energy emitted if electron falls from $n=3$ to $n=2$ , in hydrogen atom is

• A. $0.65$ $eV$
• B. $1.9$ $eV$
• C. $10.2$ $eV$
• D. $12.09$ $eV$

Answer 1

Answer: (B)

$\Delta E=E_3-E_2=13.6\left[\frac{1}{(2{)}^2}-\frac{1}{(3{)}^2}\right]=1.9eV$