Compton Effect:

Scatter x-rays off electrons in carbon

$$E_{\gamma } = hf = \displaystyle\frac{hc}{\lambda }\rightarro... ...^{\prime }-\lambda = \displaystyle\frac{h}{m_eC}(1-\cos\theta )$$

$$p_{\gamma } = \displaystyle\frac{E_{\gamma }}{C} = \displaystyle\frac{h} {\lambda }$$