# You use x-ray photons of wavelength 0.251 nm in a Compton-scattering experiment. At a scattering angle of 14.5°, what is the increase in the wavelength of the scattered x rays compared to the incident x rays?

You use x-ray photons of wavelength 0.251 nm in a Compton-scattering experiment. At a scattering angle of ${14.5}^{\circ }$, what is the increase in the wavelength of the scattered x rays compared to the incident x rays? Express your results in nm.
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Frances Dodson
We have the expression of the Compton effect,
${\lambda }_{f}-{\lambda }_{i}=\frac{h}{{m}_{e}c}\left(1-\mathrm{cos}\theta \right)$
So, we easily calculate the final wavelength,

So, the increasing wavelength,

But we have to calculate in nm
so, we change m into nm