Calculation of Cherenkov radiation：Cone angle.

Keyword Cherenkov radiation,Cone angle,Speed of light in vacuum,Refraction index of medium,Speed of particle.

Reference [1]：Graham Woan著･堤正義訳：『ケンブリッジ物理公式ハンドブック』,共立出版,pp.154,2007. [2]：Cerenkov Radiation：University of Pennsylvania Department of Physics and Astronomy

Remarks ・LaTex：　\sin \theta =\frac{c}{\eta v} ・Making above Equation Image is powered by CODECOGS

History ・2010/05/15：Bug Fix. ・2010/05/14：Upload.