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You can use Plank's relation to calculate the energy of the absorbed photon.

E = h.f = h.c/L

given

E = Energy of a photon in Joules

f = frequency of the photon in s-1

c = speed of light in m/s

L = wavelength of the photon in metre

h = Planck constant = 6.62606957×10−34 J.s

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