When a Beam of Nuclear Radiation of Initial Intensity I₀

Multiple Choice

When a beam of nuclear radiation of initial intensity I₀ passes through a thickness x of material, the intensity of the beam exiting the material is I =

A) I₀e−μx.
B) I₀eμx.
C) I₀(e−μx − 1) .
D) I₀(eμx − 1) .
E) I₀(1 − e−μx) .