& The half life period of a radioactive element is 120 days. After 600 days one gram of the
element will reduce to
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0
Answer
Correct option is
D
16
1
g
T=n×t
1/2
Given, t
2
1
=140 days
N
0
=1 g
∴n=
t
1/2
T
=
140
560
=4
Now, Nt=N
0
(
2
1
)
n
=1×(
2
1
)
4
=
16
1
g
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