Value of wavelength in nanometres of a quantum of light, Chemistry

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The value of Planck's constant is  6.63x 10-34Js.  The velocity of light is  3.0x 108ms-1 . Which value is closest to the wavelength in nanometres of a quantum of light with frequency of 8x10 15 s-1:

(1) 3x 107                            

(2)  2x 10 -25        

(3) 5x 10 -18                       

(4)  4x 10 1

Ans:  4x 10 1

 


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