Half life of a radio active substance is 140 days.after how much time will 15g decay from 16 g sample of it?
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Answer is 560 days
0.693/140= 2.303/t log 16/16-15= 560 days
0.693/140= 2.303/t log 16/16-15= 560 days
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A/Ao = (1/2)t/T
A is final amount , t is time , & T is half life ...
A = Ao(1/2)t/T
A = Ao(1/2)560/140
A = Ao(1/2)4 = (1/16)Ao
Ao = initial amount = 1g
A = 1/16gm = 0.0625gms
this is the amount of element after 560 days
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