physics questionWatch

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Thread starter 14 years ago
#1
how do u find the closest approach of an alpha particle to a nucleus?
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14 years ago
#2
(Original post by poiuyt)
how do u find the closest approach of an alpha particle to a nucleus?
By finding the point where the electromagnetic force is at a maximum?
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14 years ago
#3
(Original post by poiuyt)
how do u find the closest approach of an alpha particle to a nucleus?
The closer it gets, the greater the angle of reflection, so measure the angles and pressumably if you get something like 160-170 degrees it's pretty much collided with it.
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Thread starter 14 years ago
#4
i have no idea thats why im asking
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14 years ago
#5
(Original post by poiuyt)
how do u find the closest approach of an alpha particle to a nucleus?
To expand on text box's idea,since they are both positivley charged the alpha particle will deflect,so the greater the angle of deflection the closer the alpha particle was to the nucleus?
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14 years ago
#6
(Original post by IntegralAnomaly)
To expand on text box's idea,since they are both positivley charged the alpha particle will deflect,so the greater the angle of deflection the closer the alpha particle was to the nucleus?
he wants a value?
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14 years ago
#7
How can you give a value to the question?

"How do you feed a dog"
"25"
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14 years ago
#8
(Original post by DazYaYYY)
he wants a value?
I would have said what you said earlier, but then it was removed
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14 years ago
#9
(Original post by DazYaYYY)
he wants a value?
you can't get a value because u don't know the atomic number of a nucleus,i.e the higher the atomic number then the greater the deflection(asumming speed of alpha particle is quite high)
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14 years ago
#10
(Original post by IntegralAnomaly)
you can't get a value because u don't know the atomic number of a nucleus
just assume values: i.e. an alpha particle is a helium nuclide therefore has an atomic number of 2 and a mass number of 4
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14 years ago
#11
(Original post by airflow)
I would have said what you said earlier, but then it was removed
it lost focus, the question was too brief
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14 years ago
#12
(Original post by DazYaYYY)
just assume values: i.e. an alpha particle is a helium nuclide therefore has an atomic number of 2 and a mass number of 4
U can't assume a value!It will differ for different nuclei.
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14 years ago
#13
(Original post by IntegralAnomaly)
To expand on text box's idea,since they are both positivley charged the alpha particle will deflect,so the greater the angle of deflection the closer the alpha particle was to the nucleus?
Yes, but in terms of finding an exact point, you need to find the point where the electrostatic (or coulomb force) reaches maximum value.

I think you also made the presumption that it met it head on perhaps.
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14 years ago
#14
(Original post by IntegralAnomaly)
U can't assume a value!It will differ for different nuclei.
are you telling me that an alpha particle doesn't have a mass number of 4 and an atomic number of 2?
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14 years ago
#15
(Original post by Text_Box)
Yes, but in terms of finding an exact point, you need to find the point where the electrostatic (or coulomb force) reaches maximum value.

I think you also made the presumption that it met it head on perhaps.
but to get the coulomb force it depends on the seperation distance, the charge is cool, just the distance

you could always rearrange to get the distance?
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14 years ago
#16
(Original post by Text_Box)
Yes, but in terms of finding an exact point, you need to find the point where the electrostatic (or coulomb force) reaches maximum value.

I think you also made the presumption that it met it head on perhaps.
yes but by measuring the angle of deflection from the initial path of the particle u can calculate the force.
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14 years ago
#17
(Original post by DazYaYYY)
are you telling me that an alpha particle doesn't have a mass number of 4 and an atomic number of 2?
i meant u can't assume the value of the atomic number for the nuclei.
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14 years ago
#18
(Original post by IntegralAnomaly)
yes but by measuring the angle of deflection from the initial path of the particle u can calculate the force.
so are u saying u cud use

F = KQ1Q1/r2 which will give r2 = KQ1Q2/F ???? ( providing the force is found ) as well as the angle of deflection
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14 years ago
#19
(Original post by DazYaYYY)
but to get the coulomb force it depends on the seperation distance, the charge is cool, just the distance

you could always rearrange to get the distance?
Well perhaps, there are probably complex formulae used to calculate this distance from the nucleus, but I wouldn't know what they are! I've only just completed AS.
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14 years ago
#20
(Original post by Text_Box)
Well perhaps, there are probably complex formulae used to calculate this distance from the nucleus, but I wouldn't know what they are! I've only just completed AS.
lol in an exam they will never ever ever say " how do u find the closest approach of an alpha particle to a nucleus? " wat a load of ****.
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