Question

what will be the energy of photon if lambda is 626nm ?
$1nm = {10}^{ - 9} m$
by using the formula
$energy = \frac{hc}{lambda}$
here the value of h is
$h = 6.626 \times {10}^{ - 34} j \: s$
and value of c is speed of light that is
$c = 3 \times {10}^{8} m {s}^{ - 1}$
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