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प्रश्न
The half life period of a radioactive element is 140 days. After 560 days, 1 g of element will be reduced to
विकल्प
`(1/2) "g"`
`(1/4) "g"`
`(1/8) "g"`
`(1/16) "g"`
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उत्तर
`(1/16) "g"`
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