If a radioactive material is dacayed by 20% in a
minute. Then its half life period will be :-
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Answer:
Explanation:
use formula
nt/n0=1/2^n
where
n0 is initial
nt is how much it is decomposed at time t
n=t/t1/2
nt/n0=1/2^n
20/100 n0 /n0=1/2^1/t1/2
1/5=1/2^1/t1/2
5=2^1/t/2
log 5= 1/t1/2 log 2
0.6 = 1/ t1/2 (0.3)
1/2= 1/ t1/2
t1/2=2min
half life = 2min
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