physics question Watch

This discussion is closed.
poiuyt
Badges: 0
#1
Report Thread starter 14 years ago
#1
how do u find the closest approach of an alpha particle to a nucleus?
0
Text_Box
Badges: 0
Rep:
?
#2
Report 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?
0
john !!
Badges: 14
Rep:
?
#3
Report 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. :confused:
0
poiuyt
Badges: 0
#4
Report Thread starter 14 years ago
#4
i have no idea thats why im asking
0
IntegralAnomaly
Badges: 0
Rep:
?
#5
Report 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?
0
DazYaYYY
Badges: 0
#6
Report 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?
0
john !!
Badges: 14
Rep:
?
#7
Report 14 years ago
#7
How can you give a value to the question?

"How do you feed a dog"
"25"
0
airflow
Badges: 0
#8
Report 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
0
IntegralAnomaly
Badges: 0
Rep:
?
#9
Report 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)
0
DazYaYYY
Badges: 0
#10
Report 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
0
DazYaYYY
Badges: 0
#11
Report 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
0
IntegralAnomaly
Badges: 0
Rep:
?
#12
Report 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.
0
Text_Box
Badges: 0
Rep:
?
#13
Report 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.
0
DazYaYYY
Badges: 0
#14
Report 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?
0
DazYaYYY
Badges: 0
#15
Report 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?
0
IntegralAnomaly
Badges: 0
Rep:
?
#16
Report 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.
0
IntegralAnomaly
Badges: 0
Rep:
?
#17
Report 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.
0
DazYaYYY
Badges: 0
#18
Report 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
0
Text_Box
Badges: 0
Rep:
?
#19
Report 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.
0
DazYaYYY
Badges: 0
#20
Report 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 ****.
0
X
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Derby
    Postgraduate and Professional Open Evening - Derby Campus Postgraduate
    Tue, 22 Jan '19
  • University of the West of England, Bristol
    Undergraduate Open Afternoon - Frenchay Campus Undergraduate
    Wed, 23 Jan '19
  • University of East London
    Postgraduate Open Evening Postgraduate
    Wed, 23 Jan '19

Brexit: Given the chance now, would you vote leave or remain?

Remain (1490)
79.59%
Leave (382)
20.41%

Watched Threads

View All