... t v kat t l 2000V, cho h = 6,625.1 0-3 4 Js, c = 3.108m/s B c súng ng n nh t c a tia rnghen m ng cú th phỏt lA 4,68.1 0-1 0m B 5,25.1 0-1 0m C 3.46.1 0-1 0m D 6,21.1 0-1 0m Cõu 42: Để đo chu kì bán r chất ... l(1 u = 931MeV/c2): A 10,26(MeV) B 12,44(MeV) C 6,07(MeV) D 8,44(MeV) - H T P N THI TH I H C 2008 - 2009 - M 357 1D 2D 3B 4A 5C 6A 7C 8C 9D 10A 11B 12B 13D 14A 15D 16C 17C 18C 19A 20C ... t lỳc t thỡ li c a ph n t M l 2cm, v y lỳc t + (s) li c a M l A -2 cm B 3cm C -3 cm D 2cm Cõu 34: Chi u ỏnh sỏng tr ng (0,4àm-0,75àm) vo khe S thớ nghi m giao thoa Iõng, kho ng cỏch t hai ngu...