For l = 500 mm:
n = c/l = 3.0X108/100X10-6 = 3.0X1012

 E = 6.63X10-34 X 3.0X108/100X10-6 = 2.0X10-21 J

 For l = 100 nm:
n = c/l = 3.0X108/100X10-9 = 3.0X1015

 E = 6.63X10-34 X 3.0X108/100X10-9 = 2.0X10-18 J

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