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575nm = 575 x 10-9 m C= λv 3.00 x 108 m/s = 575 x 10-9 m (v) v= 5.22 x 1014 Hz E= hv E= 6.626 x 10-34 J (sec) x (5.22 x 1014 1/sec) E= 3.46 x 10-19 J