Thanks for your reply. The calculation in the article is difficult to grasp for me too. I'm looking a way to solve the problem via radioactive decay formula: http://en.wikipedia.org/wiki/Exponential_decay
Hi,
In a Particle Physics class, our instructor requested me to calculate the life time of proton. There are some sources telling that its life time is ~10^32 years, however there are no basic calculations. There is this article about calculation...