Question

Thallium-207 has a half-life of 4.77 minutes. If an initial sample weighed 155 grams, and

now only weighs 2.42 grams, how many half-lives have occurred?
A.4
B.6
C.5
D.3

Answer 1

6

Step-by-step explanation:

You divide the initial sample weight (155) by 2 until you get to 2.42.