Questions
The half life of a certain radioactive isotope is 28 hr’s . What fraction of sample would remain after 7 h ?
a
0.68
b
0.65
c
0.71
d
0.84
detailed solution
Correct option is D
Decay Law , N = No12n where n = no of half lives = tTh=728=14=0.25 ∴Remaining fraction = N No=120.25 =0.84Talk to our academic expert!
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