Question

The number of photons of light of y = 2.5 x 100m-1 necessary to provide 1 J of energy are???

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Answer 1

Answer:

λ/19.8×10⁻²⁶  (here,λ is the wavelength of light used,)

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Explanation:

we know that

energy of one photon=hc/λ

where

h=6.6×10⁻³⁴ Js

c=3×10⁸m/s

hc=6.6×10⁻³⁴×3×10⁸=19.8×10⁻²⁶

given

λ=i didnt understand so take it as λ itself

so the energy one photon is=19.8×10⁻²⁶/ λ

let the no of photons required equal to n

so,n(19.8×10⁻²⁶/ λ)=1J

n=λ/19.8×10⁻²⁶

on substituting the value of λ and after calculation you will get the required number of photons of light.