An α - particle with kinetic energy 10 MeV is heading towards a stationary point nucleus of atomic number 50 from large separation. Calculate the distance of closest approach
1.44×10−4 ∘A
By energy conservation
Ki+Ui=Kf+Uf
10×106 e+0=0+9×109×(2e)(50e)r0
r0=1.44×10−4 ∘A