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JEEMAIN-2015
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Q)
Let
N
β
be the number of
β
particles emitted by
1
g
r
a
m
of
N
a
24
radioactive nuclei (half life = 15 hrs) in
7.5
hours ,
N
β
is close to (Avogadro number
6.2
×
10
21
7.5
×
10
21
1.25
×
10
22
1.75
×
10
22
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