Tóm tắt:

$h=6,625\,.\,{{10}^{-34}}$

$c=3\,.\,{{10}^{8}}$

$A=3,{{04825.10}^{-19}}$

${{W}_{d\max }}=1,92\,.\,{{10}^{-19}}$

$\lambda =?$

………………………………………………………………..

$\,\,\,\,\,\,{{W}_{d\max }}=\varepsilon -A$

$\to \varepsilon ={{W}_{d\max }}\,+\,A\,=\,4,96825\,.\,{{10}^{-19}}$

$\,\,\,\,\,\,\varepsilon =\dfrac{hc}{\lambda }$

$\to \lambda =\dfrac{hc}{\varepsilon }=\dfrac{6,625\,.\,{{10}^{-34}}\,.\,3\,.\,{{10}^{8}}}{4,96825\,.\,{{10}^{-19}}}=0,4\,\mu m$

$\to $ ánh sáng tím

$\to$ câu $C$

Ánh sáng đỏ:                      $0,64\,\mu m\,\,\le \lambda \le \,\,0,76\,\mu m$

Ánh sáng cam:                   $0,59\,\mu m\,\,\le \lambda \le \,\,0,65\,\mu m$

Ánh sáng vàng:                 $0,57\,\mu m\,\,\le \lambda \le \,\,0,6\,\,\mu m$

Ánh sáng lục:                     $0,5\,\mu m\,\,\le \lambda \le \,\,0,575\,\mu m$

Ánh sáng lam:                    $0,45\,\mu m\,\,\le \lambda \le \,\,0,51\,\mu m$

Ánh sáng chàm:                $0,43\,\mu m\,\,\le \lambda \le \,\,0,46\,\mu m$

Ánh sáng tím:                     $0,38\,\mu m\,\,\le \lambda \le \,\,0,44\,\mu m$