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A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°.What is the modified wavelength？（）

A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°.What is the modified wavelength？（）
A.5.56730 nm
B.7.67945 nm
C.2.00243 nm
D.9.45891 nm
正确答案：2.00243 nm

标签：原子物理

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