Question

The highest excited state that unexcited horizontal hydrogen atoms can reach when they are bombarded with $12.2$ $eV$ electrons is

• A. $n=1$
• B. $n=2$
• C. $n=3$
• D. $n=4$

Answer 1

The correct option is C $n=3$

Energy at ground state $=-13.6eV$

when bombarded with $12.2eV$,energy available $=-13.6+12.2=-1.4eV$

$-1.4=-13.6/$$n^2$

$n=3.4$ mean it will reach $3^{rd}$ orbit.