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Standard XII
Physics
Law of Radioactivity
Question
20
% of a radioactive element disintegrates in
1
h
r
.The percentage of the radioactive element disintegrated in
2
h
r
s
will be
36
%
60
%
64
%
40
%
A
60
%
B
36
%
C
40
%
D
64
%
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Solution
Verified by Toppr
Let initially the number of radioactive particles be
100
.
Using the formula:
N
=
N
0
e
−
λ
t
where
λ
=
2.303
t
l
o
g
(
N
0
N
)
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