Question

Calculate the energy transition from n=3 to n=1 what region of the electromagnetic spectrum is this region

Answer 1

Answer:

Since you did not specify, I'm going to assume you mean, hydrogen with a single electron.

E(photon)= 1.89eV

λ=655.2

E(ph)=hcR((1/n(lower))²-(1/n(upper))²)

→hcR=13.6eV

E(ph)=13.6 (1/2)²-(1/3)²

 E(ph)     =13.6(5/36)

               =h(c/λ)=hcR(5/36)

               1/λ=R(5/36)

               λ=1/R(36/5)

 1/R is a constant and is 91 nm

on substituting we get

λ=655.2 this is in the optical (it's a red-pink)

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