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Tardigrade
Question
Physics
In a radioactive sample, there are 1.414× 106 active nuclei. If they are reduced to 106 within 10min , then the half life of this sample will be,
Q. In a radioactive sample, there are
1.414
×
1
0
6
active nuclei. If they are reduced to
1
0
6
within
10
min
, then the half life of this sample will be,
200
93
NTA Abhyas
NTA Abhyas 2022
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A
5
min
0%
B
20
min
0%
C
15
min
0%
D
30
min
100%
Solution:
N
=
N
0
(
2
1
)
(
T
(
1/2
)
t
)
(
10
)
6
=
1.414
×
(
10
)
6
(
2
1
)
(
T
1/2
t
)
(
2
1
)
=
(
2
1
)
(
T
1/2
t
)
t
1/2
t
=
2
1
t
1/2
=
2
t
=
20
min
.