1.

10g of a radioactive substance is reduced to 1.25 g after 15 days. Its 1kg mass will reduce to 500g in

Answer»

500 days
125 days
25 days
5 days

Solution :`N = [(1)/(2)]^(n) xx N_(0)`
`1.25 = [(1)/(2)]^(n) xx 10`
`[(1)/(2)]^(n) = (1.25)/(10) = (1)/(8) = [(1)/(2)]^(3) , n = 3`
Half-life time `= (15)/(3) = 5` days


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