In 90 seconds, the mass of a radioactive element reduces ...
In 90 seconds, the mass of a radioactive element reduces to 116 of its original value. Determine the half- life of the element.
15.0s
18.0s
22.5s
30.0s
45.0s
Correct answer is C
116=(12)n
(12)4=(12)n
n=4
90 secs = 4 half lives
1 half life = 904 secs
= 22.5 secs
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