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Manipal Entrance Test 2017 Physics Paper
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© examsnet.com
Question : 21
Total: 50
The half-life period of radium is
1600
yr
. The fraction of a sample of radium that would remain after
6400
yr
is
1
4
1
2
1
8
1
16
Validate
Solution:
Fraction
=
N
N
0
=
(
1
2
)
6400
1600
=
(
1
2
)
4
=
1
16
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