A nucleus with mass number 220 initially at rest emits an αparticle. If the Q value of the reaction is 5.5MeV, calculate the kinetic energy of the αparticle
4.4MeV
5.4MeV
5.6MeV
6.5MeV
A
5.4MeV
B
4.4MeV
C
5.6MeV
D
6.5MeV
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Solution
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M→X+α E=p22m Let Total energy = T T=Eα+EX M=Mα+MX MX=216 Conservation of momentum pα=pX mαEalpha=mXEX Eα=mxMT Eα=2162205.5=5.4MeV
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