Calculate the energy in joule corresponding to light of wavelength 45 , nm : (Planck's constant h = 6.63 10 -34 , Js ; speed of light c = 3 10 8 , ms -1 )

1. A. 6.67 10 15
2. B. 6.67 10 11
3. C. 4.42 10 -15
4. D. 4.42 10 -18

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