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AIPMT 2011 Physics and Chemistry Solved Paper
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© examsnet.com
Question : 61
Total: 100
A radioactive nucleus of mass
M
emits a photon of frequency
v
and the nucleus recoils. The recoil energy will be :
Mc
2
−
h
υ
h
2
v
2
/
2
M
c
2
zero
h
υ
Validate
Solution:
Momentum
M
u
=
E
c
=
h
u
c
Recoil energy
1
2
M
u
2
=
1
2
M
2
u
2
M
=
1
2
M
(
h
u
c
)
2
=
h
2
v
2
2
M
c
2
© examsnet.com
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