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Standard XII
Chemistry
Rutherford's Alpha Scattering Experiment
N atoms of a ...
Question
N atoms of a radioactive element emit n alpha particles per second. The half life of the element is
A
n
N
s
e
c
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B
N
n
s
e
c
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C
0.693
N
n
s
e
c
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D
0.693
n
N
s
e
c
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Solution
The correct option is
C
0.693
N
n
s
e
c
d
N
d
t
=
−
λ
N
⇒
n
=
−
λ
N
(
G
i
v
e
n
d
N
d
t
=
n
)
∴
λ
=
−
n
N
∴
Half life =
0.693
λ
=
0.693
λ
=
0.693
N
n
s
e
c
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