A sample of radiative substance is found...

A sample of radiative substance is found `90%` of it’s initial amount after one day. What `%` of the original sample can be found after 3 days ?

72.9

`65.61`

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The correct Answer is:

Equal fraction decay in equal periods of time, fraction of sample remaining after 3 days `rArr(0.9)^(3)=0.729`

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