物理奧林匹克題目

網上看了一題物理奧林匹克題目。

The Cherenkov radiation is caused by an electron moving faster than the speed of light in a medium, such as gas. At any instance, the electron can be considered as a point source emitting spherical electromagnetic wave. Suppose the electron is not slowing down, find the shape of the wave front and its relation with the electron trajectory, in terms of the electron speed v, refractive index of the medium n, and speed of light in vacuum c.

看畢後，整個人呆了起來，張大了口，拿起字典不斷查，也未能完全理解問題，更莫說寫出答案。

開始懷疑自己不是讀理科的材料。