Sarthaks Test
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How many photons of red colored light having wavelength 8000 Å will have same energy as one photon of violet colored light of wavelength 4000 Å? 

(A) 2 

(B) 4 

(C) 6 

(D) 8

1 Answer

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Best answer

The correct option is (A) 2.


E1 = (hc / λ1) and E2 = {(nhc) / λ2}

Given energies are same 


(hc / λ1) = {(nhc) / λ2}

∴ n = (λ2 / λ1) = {(8000) / (4000)} = 2

∴ number of photons of red light = 2.

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