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What is the half-life of a radioactive s...

What is the half-life of a radioactive substance if 75% of a given amount of the substance disintegrates in 30 minutes

A

7.5 min

B

25 min

C

20 min

D

15 min

Text Solution

Verified by Experts

The correct Answer is:
D
75% of the substance disintegrates in two half lives. 2 half lives = 30 min `therefore t_(1//2) = 15` min
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