1.

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

Answer»

`(1)/(2) g`
`(1)/(4) g`
`(1)/(8) g`
`(1)/(16) g`

Solution :No. of half-lifes `= (560)/(140) = 4`, If 'n' half LIVES, the element
will reduce of `((1)/(2))^(n) xx " initial weight " = (1)/(16) gm`


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