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VITEEE 2014 Solved Paper
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© examsnet.com
Question : 20
Total: 120
A neutron is moving with velocity u. It collides head on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron is E, then how much kinetic energy will be retained by the neutron after reflection?
(
A
A
+
1
)
2
E
A
(
A
+
1
)
2
E
(
A
−
1
A
+
1
)
2
E
(
A
−
1
)
(
A
+
1
)
2
E
Validate
Solution:
Fraction retained by nucleus
(
∆
k
k
)
retained
=
(
m
2
−
m
1
m
1
+
m
2
)
2
=
(
A
−
1
A
+
1
)
2
After collision kinetic energy retained by neutron
(
A
−
1
A
+
1
)
2
E
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