P Cherenkov 1934 + Frank-Tamm 1937 (Nobel 1958) charged-particle in medium emits cone v > c/n; modern IceCube + KM3NeT neutrino-telescopes.
P Cherenkov 1934 + Frank-Tamm 1937 (Nobel 1958) charged-particle in medium emits cone v > c/n; modern IceCube + KM3NeT neutrino-telescopes.