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Old Oct 25th 2014, 09:31 AM   #1
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Kinetic energy of alpha particle in cockroft walton experiment.

1.*The*problem statement, all variables and given/known data
When a*7*3*Li nucleus is bombarded with protons α particles emerge.Calculate the kinetic energy of the alpha particle assuming the kinetic energy of the bombarding proton to be negligible. Given M (7*3*Li)=7.016004a.m.u. M (p)=1.007826a.m.u and
M(α)=4.002603a.m.u.
2.Relevant equations
7*3*Li +*1*1H --> 2 4*2He
Q = (M*Li*+ MH*-2Mα)931.5MeV....1
Kα=n= [MαQ + Kp(Mα*- mp)]/2Mα....2
3. The attempt at a solution
Using equation 1 Q=(7.016004+1.007826- 24.002603) 931.5 =17.35MeV
It is given that Kp~0 so Kα= Q/2 =8.675MeV
What do you people think about my solution methods used? The numerical values are matching approximately with the given answers in the text book by the way.

Last edited by pranimaboity2050; Oct 25th 2014 at 09:44 AM.
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Old Oct 25th 2014, 01:44 PM   #2
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Originally Posted by pranimaboity2050 View Post
1.*The*problem statement, all variables and given/known data
When a*7*3*Li nucleus is bombarded with protons α particles emerge.Calculate the kinetic energy of the alpha particle assuming the kinetic energy of the bombarding proton to be negligible. Given M (7*3*Li)=7.016004a.m.u. M (p)=1.007826a.m.u and
M(α)=4.002603a.m.u.
2.Relevant equations
7*3*Li +*1*1H --> 2 4*2He
Q = (M*Li*+ MH*-2Mα)931.5MeV....1
Kα=n= [MαQ + Kp(Mα*- mp)]/2Mα....2
3. The attempt at a solution
Using equation 1 Q=(7.016004+1.007826- 24.002603) 931.5 =17.35MeV
It is given that Kp~0 so Kα= Q/2 =8.675MeV
What do you people think about my solution methods used? The numerical values are matching approximately with the given answers in the text book by the way.
Looks good to me.

-Dan
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