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Energy of Photon = Planck's constant x speed of light / wavelength

= 6.63 x 10-34 x 3 x 108 / 1050 x 10-9

= 1.89 x 10-19 Joules = 1.89 x 10-19 / 1.6 x 10-19 = 1.181 eV

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