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Byju's Answer
Standard XII
Chemistry
Heat Capacity
The half life...
Question
The half life of a radioactive substance is
13
years. The decay constant is,
A
1.96
×
10
−
9
sec
−
1
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B
1.29
×
10
−
7
sec
−
1
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C
1.69
×
10
−
10
sec
−
1
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D
1.69
×
10
−
9
sec
−
1
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Solution
The correct option is
D
1.69
×
10
−
9
sec
−
1
Half life period,
T
1
/
2
=
13
years
T
=
13
×
365
×
86400
sec
Decay constant is given by,
λ
=
0.693
T
1
/
2
=
693
×
10
−
3
13
×
365
×
86400
λ
=
1.69
×
10
−
9
sec
−
1
Hence,
(
C
)
is the correct answer.
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