I'm trying to figure out how many atoms are decaying spontaneously in a span of 2 seconds. Let's say that the quantum yield is 0.45, and that the lifetime "τ" (tau) is 10 microseconds.
Then I found that the radiative lifetime is 22.2 microseconds. However, at this point I'm stuck. I don't know a relationship in order to get the amount of spontaneously decayed atoms.
What relationship is there in order to get spontaneous decayed atoms with this information? Also, this is homework, so just a hint would be appreciated.