0 MeV beam of a particles strikes an aluminum target . Determine the distance of closest approach between a particles of such energy and aluminum...

1. A 3.0 MeV beam of a particles strikes an aluminum target. Determine the distance of closest approach between a particles of such energy and aluminum nuclei in the target. Calculate the number of nuclei per unit volume in aluminum, which has atomic number 13, atomic mass 27, and density 2.70 g/cm3.
2. Suppose that the a-particle beam of Problem 1 carries 10^5 a particles per second to the aluminum target, which is a foil of thickness 1.0 x10-4 cm. Calculate the number of a particles scattered per second into the backward hemisphere.

please show all steps

2 . A 3. 0 MeV beam of a particles strikes an aluminum target . Determine the distance of closestapproach between a particles of such energy and aluminum nuclei in the target . Calculate thenumber of nuclei per unit volume in aluminum , which has atomic number 13 , atomic mass 27 ,and density 2. 70 8 / cm" .3 . Suppose that the a - particle beam of Problem 2 carries 10' a particles per second to the aluminumtarget , which is a foil of thickness 1.0 x 10* cm . Calculate the number of a particles scattered persecond into the back ward hemisphere .