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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

Sagot :

Answer:

6

Explanation:

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

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