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BITSAT 2023 Shift 1 Solved Question Paper
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© examsnet.com
Question : 3
Total: 130
A radio-active material is reduced to
1
∕
8
of its original amount in 3 days. If
8
×
10
−
3
kg
of the material is left after 5 days. The initial amount of the material is
700 gm
900 gm
475 gm
256 gm
Validate
Solution:
👈: Video Solution
N
=
N
0
(
1
2
)
n
N
=
N
0
8
N
0
8
=
N
0
(
1
2
)
n
⇒
(
1
2
)
3
=
(
1
2
)
n
n
=
3
3
half lives
=
3
days
1
half life
=
1
day
5
days
=
5
half life
N
=
N
0
(
1
2
)
n
⇒
8
×
10
−
3
=
N
0
(
1
2
)
5
⇒
N
0
=
2
5
×
8
×
10
−
3
=
256
gm
© examsnet.com
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