1.

The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to

Answer»

`(1//2) G`
`(1//4) g`
`(1//8) g`
`(1//6) g`

Solution :FRACTION REMAINING `= ((1)/(2))^(N)`
`= ((1)/(2))^(560//140) = ((1)/(2))^(4) = (1)/(16)`


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