Question

What is the energy of a wavelength of light of 550 nm?

Answer 1

H = planks constant (6.63 x 10^-34) 
c = speed of light(3x10^8) 
wavelength(in meters is 550x10^-9) 

=6.63x10^-34(3x10^8/550x10^-9) 
=6.39x10^-14 

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