For a radioactive material, half-life is...

For a radioactive material, half-life is `10` minutes. If initially there are `600` number of nuclei, the time taken (in minutes) for the disintegration of `450` nuclei is.

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Half life =10 minutes
so `600 overset(???)(to)300overset(???)(to)150`
`implies` Total time =2 half life =20 min.

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