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The half life of a radio active materia...

The half life of a radio active material is one hour.What would be the time required for `99.9%` completion

A

5 hours

B

10 hours

C

2 hours

D

20 hours

Text Solution

Verified by Experts

The correct Answer is:
B
`t_(99.9%) = 10 xx t_(50%)`
`93.75%` completion equal to 4 half lifes.
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