The half-life of radium is 1,690 years. how long will it take for a 50-gram sample of radium to be reduced to 5 grams? The answer should be 5,614 years.
The formula I'm using is Q(t)=Q0e-kt and I believe I am to use h= ln2/k. Here's what I've done:
I divide by 1,690 and get -5.917...
I'm not sure where to use the h= ln2/k, I tried putting it in for k, it didn't look right so I erased it all and went back to square one. Any help is greatly appreciated. :]