1.

A substance is kept for 2 hours and three-fourth of that substance disintegrates during this period. The half life of the substance isA. 2 hrB. 1 hrC. 30 minD. 4 hr

Answer» Correct Answer - B
Given,
Amount left `N = 1 - (3)/(4) = (1)/(4)`
`N = N_(0) ((1)/(2))^(n) implies ((N)/(N_(0))) = ((1)/(2))^(n)`
`implies ((1)/(4)) = ((1)/(2))^(n)` or `n = 2`
we know `T = n xx t_(1//2) implies t_(1//2) = (2)/(2) = 1 hr`


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