1.

The disintegration constant of radium with half-life 1600 years isA. `2.12 xx 10^(-4)"year"^(-1)`B. `4.33 xx 10^(-4)"years"^(-1)`C. `3.26 xx 10^(-3)"year"^(-1)`D. `4.33 xx 10^(-12)"year"^(-1)`

Answer» Correct Answer - B
`k = (0.693)/(t_(1//2)) = (0.693)/(1600) = 4.33 xx 10^(-4) "year"^(-1)`


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