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Standard XII
Physics
Nucleus: Common Terms
During the me...
Question
During the mean life of a radioactive element, the fraction that disintegrates is-
A
1
e
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B
e
e
−
1
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C
e
−
1
e
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D
e
e
−
1
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Solution
The correct option is
C
e
−
1
e
The mean lifetime ,
t
=
1
λ
Fraction that disintegrates is,
N
0
−
N
t
N
0
=
N
0
−
N
0
e
−
λ
t
N
0
=
1
−
e
−
λ
×
1
λ
=
1
−
1
e
=
e
−
1
e
Hence,
(
C
)
is the correct answer.
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