A.) C.) The distance of closest approach would begreater than that found in part

Question

A.) C.) The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B. The distance of closest approach would begreater than that found in part B. The distance of closest approach would be lessthan that found in part B. The distance of closest approach would be thesame as in part B.

Explanation / Answer

Kinetic energy K = 0.8 MeV = 0.8 * 1.6 * 10 ^ -13 J

Speed of alpha particle v = [ 2K / m]

Where      m=mass = 4* 1.67 * 10 ^ -27kg

plug the values we get v = 6.19*10^6 m / s

(b). At closest distance K.E = Potential energy

         0.8*1.6*10^-13 = KQq / r

From this closest distance   r = KQq / (0.8*1.6*10^-13)

Where q = charge of alpha = 2* 1.6 * 10 ^ -19 C

           K = 8.99*10^9 Nm^ 2/ C ^ 2

           Q=79 * 1.6 * 10 ^ -19 J

Plug the values we get r = 2.84* 10 ^ -13 m

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