# Write an equation for the average fractional energy loss ?E of a neutron in an elastic collision…

Write an equation for the medium fractional breath loss ΔE of a neutron in an resilient encounter after a while a Carbon-12 particle having an ultimate efficacy of 12.

Suppose that an trial reveals that the medium scattering leaning of a neutron is 75°. What is the particleic efficacy of the material after a while which the neutron is scattering?