Question

what is the energy of photon in a beam of Infrared radiation of wavelength 1240nm?​

Answer 1

Answer:

E=hf=hcλ=1240 eV ⋅ nm100 nm=12.4 eV E = h f = h c λ = 1240 eV ⋅ nm 100 nm = 12.4 eV .

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Answer 2

So,there is a direct formula to calculate energy if wavelength is given

E = 12400 / λ  

Note : We have to put λ in A° and we will get the energy in eV.

Given λ = 1240 nm

             = 12400  A°

putting the value in the formula ,E = 12400/12400

                                                         = 1 eV