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JEE Advanced 2018 Paper 2
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© examsnet.com
Question : 5
Total: 54
Ina radioactive decay chain,
90
232
T
h
nucleus decay to
82
212
P
b
nucleus.Let
N
α
and
N
β
be the number of
α
and
β
−
particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
N
α
=
5
N
α
=
6
N
β
=
2
N
β
=
4
Validate
Solution:
90
232
T
h
is converting into
82
212
P
b
Change in mass number (A)
=
20
Number of
α
particle
=
20
4
=
5
Due to 5
α
particle, z will be change by 10 unit.
Since given change is 8, therefore number of
β
particle is 2
© examsnet.com
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