A certain nucleide has half life period ...

A certain nucleide has half life period of 30 min. If a sample containing `6xx10^(10)` atoms is allowed to decay for 90 min, how many atoms will remain ?

`2xx10^(10)` atoms

`4.5xx10^(9)` atoms

`7.5xx10^(9)` atoms

`1.5xx10^(9)` atoms.

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