In compton scattering process, the incident $X$-radiation is scattered at an angle $60^{\circ}$. The…

In compton scattering process, the incident $X$-radiation is scattered at an angle $60^{\circ}$. The wavelength of the scattered radiation is $0.22 Ã…$. The wavelength of the incident $X$-radiation in $Ã…$ units is
  1. $0.508$
  2. $0.408$
  3. $0.232$
  4. $0.208$

Solution

For Compton effect we have the relation
$\lambda_2-\lambda_1=\frac{h}{m_0 c}(1-\cos \theta)$
$\lambda_1=$ wavelength of incident radiation
$\lambda_2=$ wavelength of scattered radiation
$\begin{aligned}
\therefore 0.22-\lambda_1 & =0.024(1-\cos 60) \\
0.22-\lambda_1 & =0.024\left(1-\frac{1}{2}\right) \\
0.22-\lambda_1 & =0.024 \times \frac{1}{2} \\
\lambda_1 & =0.22-0.012=0.208 Ã…
\end{aligned}$

Asked in: AP EAMCET 2002

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