Show that the mean free path, a that a neutron travels before having an interaction is given by: (15 pts.) given that the density of beryllium is 1.848g/cc and its microscopic total cross-section at 0.0253 ev is 6.508 b. calculate the mean free path of a 0.0253 ev neutron in beryllium. b. c. (15 pts.) given that the density of water is 1 g/cc. assume water consists of only h 2h and 160. the microscopic total cross-sections of its constituents at 0.0253 ev are as follows: ơt('h) is 30.414 bal 2h) is 4.236 bal 160) is 3.973 b. calculate the mean free path of a 0.0253 ev neutron in water.