Question

what is wavelength and frequency of photon during transition of n=5state to n= 2 state it in helium ions​

Answer 1

since n1=5andn1=2, this transition gives rise to a spectral line in the visible region of the balmer series. From equation

ΔE=2.18×10−18J[152−122]

4.58×10−19J

it is an emission energy

the frequency of the photon ( taking energy in terms of magnitude ) is given by

v=ΔEh

4.58×10−19J6.626×10−34Js

6.91×1014Hz

λ=cv=3.0×108ms−16.91×1014Hz=434nm

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