Goi goc can tim la $\alpha$ thiTheo dinh ly ham sin co $\frac{m_{p}.v_{p}}{sin(180-2\alpha )}=\frac{m_{He}.v_{He}}{sin\alpha }$ $<=>\frac{sin^{2}\alpha }{sin^{2}2\alpha }=\frac{m_{He}.K_{He}}{m_{p}.K_{p}}$Lai theo bao toan nang luong co $K_{p}=2K_{He}$Theo do $ \frac{sin^{2}\alpha }{sin^{2}2\alpha }=\frac{1}{2}.4=2$Tu do tinh dk $\alpha =45^{o}$
Goi goc
giua
hat
He va proton la $\alpha$ thiTheo dinh ly ham sin co $\frac{m_{p}.v_{p}}{sin(180-2\alpha )}=\frac{m_{He}.v_{He}}{sin\alpha }$ $<=>\frac{sin^{2}\alpha }{sin^{2}2\alpha }=\frac{m_{He}.K_{He}}{m_{p}.K_{p}}$Lai theo bao toan nang luong co $K_{p}=2K_{He}$Theo do $ \frac{sin^{2}\alpha }{sin^{2}2\alpha }=\frac{1}{2}.4=2$Tu do tinh dk $\alpha =
69,29^{o}$Vay goc can tim la $2\alpha =138,5
9^{o}$