Asked by jen

Here are some half-lives for different isotopes of bismuth (Bi):


Bi-211 — 2.1 minutes

Bi-212 — 60.6 minutes

Bi-213 — 45.7 minutes

Bi-214 — 19.9 minutes

If there are 200 grams of one isotope of bismuth, and after 60.6 minutes there are 100 grams of bismuth, what isotope is it?
Answered by DrBob222
So the Bi has gone through 1 half life since it has decreased from 200 g to 100 g. And it did that in 60.6 minutes so the half life of the isotope must be 60.6 minutes. and that is .......?
Answered by jen
no but these are my choices


A. Bi-212
B. Bi-211
C. Bi-213
D. Bi-214
Answered by DrBob222
WHICH ONE HAS A HALF-LIFE OF 60.6?
Answered by em
Answer anyone?