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physics question

poiuyt

how do u find the closest approach of an alpha particle to a nucleus?

Reply 1

Text_Box

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?

Reply 2

john !!

14

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. :confused:

Reply 3

poiuyt

OP

i have no idea thats why im asking :smile:

Reply 4

IntegralAnomaly

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?

Reply 5

DazYaYYY

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?

Reply 6

john !!

14

How can you give a value to the question?

"How do you feed a dog"
"25"

Reply 7

airflow

DazYaYYY

he wants a value?

I would have said what you said earlier, but then it was removed

Reply 8

IntegralAnomaly

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)

Reply 9

DazYaYYY

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

Reply 10

DazYaYYY

airflow

I would have said what you said earlier, but then it was removed

it lost focus, the question was too brief

Reply 11

IntegralAnomaly

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.

Reply 12

Text_Box

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.

Reply 13

DazYaYYY

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?

Reply 14

DazYaYYY

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?

Reply 15

IntegralAnomaly

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.

Reply 16

IntegralAnomaly

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.

Reply 17

Text_Box

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. :smile:

Reply 18

DazYaYYY

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

Reply 19

DazYaYYY

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. :smile:

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 shit.

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