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CBSE Class 12-science Answered

a human body requires .01cactivity of a radioactive substance for 24 hrs . half life of radioactive substance is 6 hours . then injection of maximum activity of radioactivity of radioactive substance can be ?
Asked by Atulcaald | 31 May, 2018, 09:43: PM
Expert Answer
G i v e n colon
H a l f space l i f e equals space 6 space H r
N u m b e r space o f space h a l f space l i f e space left parenthesis n right parenthesis space i n space 24 space h r space equals 24 over 6 equals space 4 space space space space n equals 4

T h e space a c t i v i t y space a f t e r space 4 space h a l f l i f e space equals space 0.01
T h e space i n i t i a l space a c t i v i t y space o f space t h e space s a m p l e space c a n space b e space c a l c u l a t e d space a s space
A c t i v i t y space a f t e r space 4 space h a l f space l i f e space equals space I n i t i a l space a c t i v i t y space cross times open parentheses 1 half close parentheses to the power of n

space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0.01 space M space equals space i n t i a l space a c t i v i t y cross times open parentheses 1 half close parentheses to the power of 4
I n i t i a l space a c t i v i t y space equals space 0.01 space cross times space 2 to the power of 4 space equals space 0.16 space M
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