If you use Planck-Einstein equation, E = h.f where h is , which 6.626 x $10^-34$ J.s, then you can work out the frequency: f = E/h, = 4.41 x $10^-19$/6.626 x $10^-34$ = 6.655 x $10^14$ Hz.
Then convert frequency to wavelength using $lambda$ = c/f where c is the speed of light, 3 x $10^8$ m/sec.
$lambda$ = 3 x $10^8$ / 6.655 x $10^14$ = 4.51 x $10^-7$ m.
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