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Physics
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Q)
A radioactive substance has density
ρ
, volume V, and decay constant
λ
. If the molecular weight of the substance is M, and Avogadro number is
N
a
then the radioactivity of the substance after time 't' is
(
1
)
(
λ
V
ρ
N
a
M
)
(
1
−
e
−
λ
t
)
(
2
)
(
t
N
a
V
ρ
M
)
e
−
λ
t
2
(
3
)
λ
N
a
V
ρ
M
e
−
λ
t
(
4
)
λ
V
ρ
N
a
e
−
λ
t
M
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