Example Questions of Pair Production

Hi everyone, we found some interesting example questions on pair production topics while searching for information regarding pair production. Hope it helps you guys :) 

 
Taken from 

https://phys.libretexts.org/Bookshelves/Modern_Physics/Book%3A_Spiral_Modern_Physics_(D'Alessandris)/4%3A_The_Photon/4.3%3A_Pair_Production  

You guys can check out this website to see other examples:

https://nucmedtutorials.files.wordpress.com/2017/10/interaction-of-ionizing-radiation-with-matter_vf.pdf