1.

The half life period of a radioactive element is 140 days . After 560 days , 1 g of element will be reduced to ........

Answer»

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

Solution :in 140 days `implies` initial CONCENTRATION reduced to `(1/2)g`
in 280 days `implies` initial concentration reduced to `(1/4)g`
in 420 days `implies` initial concentration reduced to `(1/8)g`
in 560 days `implies` initial concentration reduced to `(1/16)g`


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