FIGURE Q25.2 shows the potential energy of a proton (q = +e) and a lead nucleus (q = +82e). The horizontal scale is in units of femtometers, where 1 fm = 10^-15m.

a. A proton is fired toward a lead nucleus from very far away.How much initial kinetic energy does the proton need to reach a turning point 10 fm from the nucleus? Explain.b. How much kinetic energy does the proton of part a have when it is 20 fm from the nucleus and moving toward it, before the collision.

Transcribed Image Text:

U (X10-12 J) 4- 2- r (fm) 40 0- 20 FIGURE Q25.2