A stationary thoron nucleus ( 
) emits an alpha particle with kinetic energy. What is the kinetic energy of the recoiling nucleus?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The 
‐particle emitting radioactive gas, Thoron‐220, decays to Radium‐216 and emits and 
‐particle. The reaction can be represented by
By conservation of momentum, we have momentum of 
‐pa1ticle 
momentum of recoiling nucleus 
The kinetic energy of 
is related to the kinetic energy of alpha particle 
by the reaction below
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