$\therefore \,\,\lambda = \frac{h}{{mc}}\,\, = \,\,\frac{{6.652 \times {{10}^{ - 27}}}}{{1 \times {{10}^{ - 3}} \times 4.5 \times {{10}^5}}}\,\,\,$
$= \,\,\frac{{6.652 \times {{10}^{ - 29}}}}{{4.5}}\,cm\,\, = \,\,1.4722 \times {10^{ - 29}}\,cm$
$\Psi_{2 en }=\frac{1}{2 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{1 / 2}\left(2-\frac{r}{a_0}\right) e^{-r / 2 a_0}$
$r=r_o$ પર રેડિયલ નોડ બને છે. તેથી, $a_0$ ના સંદર્ભમાં $r_0$.