Considering the Cherenkov effect in water (n1.33), determine: (1) the minimum velocity of a charged particle for

Considering the Cherenkov effect in water (n¼1.33), determine: (1) the minimum velocity of a charged particle for emitting radiation, (2) the minimum kinetic energy for a proton and a pion to do so, and (3) the Cherenkov angle for a pion with energy E_π = 400 MeV.