Answer to Question 2

Back

(a) Charge on the alpha particle = 2 1.6 10-19 C

(b) Charge on the gold nucleus = 79 1.6 10-19 C

(c) Energy of the alpha particle =  5 MeV = 5 106 eV 1.6 10-19  J eV-1 = 8.0 10-13 J

(d) Closest approach,

r = 9.0 109 m F-1 2 1.6 10-19 C 79 1.6 10-19 C = 4.6 10-14 m

                                               8.0 10-13