A radon nucleus 86 Rn 222 , of mass 
, undergoes 
-decay. The 
-particle has mass 
and energy 
.
Text Solution
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Sol. The atomic number will be reduced by 2 and the mass number by 4 .
The resulting nucleus is 
.
mass of resulting nucleus 
Let 
its velocity of recoil
Mass of 
-particle 
Velocity of 
-particle 
with 
Now 
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