Question

you have 87,520 grams of a radioactive kind of lead. How much will be left after 108 minutes if its half-life is 27 minutes

Answer 1

The answer is 5470 grams of lead will be left.

Explanation:

Given:

The half life of lead is 27 minutes

Now,

108/27 = 4

Here, we get the value 4 so, we divide the amount of lead by 4². i.e., 16

Now,

87520/16 = 5470

Thus, After 108 minutes 5470 grams of lead will be left.

-TheUnknownScientist 72

Answer 2

5,470 mg

Explanation:

108 minutes is 4 half-lives:

Time Lead

Min. mg Pb

0 87520

27 43760

54 21880

81 10940

108 5470