1.

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 ?

Answer»

`2XX10^(10)` ATOMS
`4.5xx10^(9)` atoms
`7.5xx10^(9)` atoms
`1.5xx10^(9)` atoms.

Answer :C


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