[领域]近代物理 (题目相关领域) [来源]普化课本 (课本习题、考古题、参考书...) [题目] Could neutrons be used for diffraction studies of molecules? The average kinetic energy of neutrons in a beam at a temperature T is kT/2, where k is Boltzmann's constant. What temperature is needed to achieve a wavelength of 100.pm for a neutron? [瓶颈] (写写自己的想法，方便大家为你解答) 中子束　就是一个直的射线 因此可看为一维运动 但是又会造成物质波 所以说算三维？ 我的算法是 p = h/λ Ek = kT/2 = p^2/2m = h^2/2mλ^2 算出来是答案的三倍左右... 所以我在想是不是要把动能改为3kT/2? 但是他题目又有提到在一束射线内的中子动能是kT/2... 请各位神人帮忙一下　谢谢＞＜ --

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