The half - life of `^(215)` At is `100 mu , s.`The time taken for the radioactivity of a sample of `^(215)` At to dacay to `1//16^(th)` of its initialy value isA. `400 mu s `B. `63 mu s `C. `40 mu s `D. `300 mu s `

The half - life of `^(215)` At is `100 mu , s.`The time taken for the

1.	The half - life of `^(215)` At is `100 mu , s.`The time taken for the radioactivity of a sample of `^(215)` At to dacay to `1//16^(th)` of its initialy value isA. `400 mu s `B. `63 mu s `C. `40 mu s `D. `300 mu s `
Answer» Correct Answer - A `A = A_(0) (1//2)^(n) , n= `number of half lives . `(A_(0))/(16) =A_(0) ((1)/(2)) ^(n) :. ((1)/(2)) ^(4) = ((1)/(2)) ^(n) ` `rArr n = 4` `:. T = (4 xx 100)mus = 400 mus`

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The half - life of `^(215)` At is `100 mu , s.`The time taken for the radioactivity of a sample of `^(215)` At to dacay to `1//16^(th)` of its initialy value isA. `400 mu s `B. `63 mu s `C. `40 mu s `D. `300 mu s `

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