# Exponential Attenuation Practice Problems

A large number of photons (N_0 = 10^{6}) interacts with a material having length L = 4.5 cm by two processes: one absorption process with a linear attenuation coefficient \mu_1 = 0.19 cm^{-1}, and one scattering process with a linear attenuation coefficient \mu_2 = 0.29 cm^{-1}. Assuming narrow-beam geometry, what is the number of photons (N) that reaches the detector? Also, how many photons interact via process 1 (\Delta N_1) and process 2 (\Delta N_2)? (Only enter integers for answer, no commas or scientific notation please)