Compton scattering can occur from atoms as well as from electrons. Part A If photons scatter...

Question

Question

Compton scattering can occur from atoms as well as from electrons.

Part A

If photons scatter from atoms of helium (He) gas, what's their maximum wavelength change?

Express your answer with the appropriate units.

Answer 1

Answer #1

Mass:

Mass of the helum atom, m = 6.645 x 10^-27 kg

Compton scattering:

Change in wavelength, $\Delta \lambda$ = ( h / m c ) [ 1 - cos $\theta$ ]

For maximum wavelength change: $\theta$ = 180 degrees

Maximum wavelength change:

$\Delta \lambda$ = { ( 6.63 x 10^-34 ) / [ ( 6.645 x 10^-27 ) * ( 3 x 10^8) ] } * [ 1 - (-1) ]

= 0.665 x 10^-15 m

Answer 2

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