Calculate the energy in corresponding to light of wavelength 45nm.


λ = 45 nm = 45 x 10-9 m

We need to find

We need to calculate the energy for the given wavelength

We know that

E = hc/λ———-(i)


  • h = Planck’s constant= 6.62607015×10−34 Js
  • c = velocity of light= 3 × 10⁸ m/s


Substituting the known values in equation (i) we get

E= 6.62607015×10−34 X 3 × 10⁸ / 45 x 10-9

E= 4.42 × 10⁻¹⁸ Joules

Hence energy for the given wavelength is 4.42 × 10⁻¹⁸ Joules

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