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v = c = 3 x 10^8 m/s
h (tetapan Planck) = 6,6 x 10^-34 Js
E = (h v) / λ
E = (6,6 x 10^-34 x 3 x 10^8)/ (2,5 x 10^-7)
E = 7,92 x 10^-19 Joule