Radioactive decay Problem
A physicst a Geiger counter to measure the decay of a radioactive sample of bismuth 212 over a period of time, he then obtained this:
Time (min) | 0 | 20 | 40| 60| 80 |100|120|140|160|180|200|
Counts per min. |702|582|423|320|298|209|164|154|124| 81 |79|
What is the half-life of this isotope? (Please explain to me how the answer was worked out, I'm not very good at half-life)
The bismuth decays into thallium by emitting an alpha particle, and this particle is 6.64 x 10^(-27) kg. What is the momentum of the alpha particle? And What is the KE of the rocoiling Thaillium nucleus? Also, What is the total energy released during the decay of 1 mole of bismuth 212?