# Alpha Scattering

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Thread starter 6 years ago
#1
Of the alpha particles that are deflected most are deflected through angles much less than 90° from their original direction.
Explain why, from this observation alone, it is impossible to deduce the sign of the charge on the nucleus.

Thanks
0
6 years ago
#2
(Original post by 1112222222233333)
Of the alpha particles that are deflected most are deflected through angles much less than 90° from their original direction.
Explain why, from this observation alone, it is impossible to deduce the sign of the charge on the nucleus.

Thanks
Try drawing a picture to show the possible directions of deflection when you have:

1) +ve alpha, +ve nucleus
2) +ve alpha, -ve nucleus

In which case is it possible to get a deflection > 90?
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Thread starter 6 years ago
#3
(Original post by atsruser)
Try drawing a picture to show the possible directions of deflection when you have:

1) +ve alpha, +ve nucleus
2) +ve alpha, -ve nucleus

In which case is it possible to get a deflection > 90?
the +ve alpha, +ve nucleus scenario?
0
6 years ago
#4
(Original post by 1112222222233333)
the +ve alpha, +ve nucleus scenario?
Right. However, what do you notice about the possible deflections in the two cases when the angle < 90?
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Thread starter 6 years ago
#5
Im not sure i understand what you mean
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6 years ago
#6
(Original post by 1112222222233333)
Im not sure i understand what you mean
Did you see any similarities between the 2 cases?
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Thread starter 6 years ago
#7
ummmm no?
are you implying that deflection occurs when the nucleus may be -ve??
How can that be?
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6 years ago
#8
(Original post by 1112222222233333)
ummmm no?
are you implying that deflection occurs when the nucleus may be -ve??
How can that be?
If the nucleus is -ve, then alpha particles are deflected towards it, but not through > 90 degrees.

If the nucleus is +ve, what range of angles are possible?
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Thread starter 6 years ago
#9
all range of angles are possible. right?
Sorry for being such a pain. I really appreciate your help
0
6 years ago
#10
(Original post by 1112222222233333)
all range of angles are possible. right?
Yes.

If the nucleus is +ve then we can see scattering angles all the way from 0-180.
If the nucleus is -ve, then we can only see scattering angles less than 90.

So if you are told that we have detected scattering angles less than 90, what does that tell you about the sign of the nucleus?
0
6 years ago
#11
(Original post by atsruser)
Yes.

If the nucleus is +ve then we can see scattering angles all the way from 0-180.
If the nucleus is -ve, then we can only see scattering angles less than 90.

So if you are told that we have detected scattering angles less than 90, what does that tell you about the sign of the nucleus?
What this guy said! Absolutely spot on!
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Thread starter 6 years ago
#12
(Original post by atsruser)
Yes.

If the nucleus is +ve then we can see scattering angles all the way from 0-180.
If the nucleus is -ve, then we can only see scattering angles less than 90.

So if you are told that we have detected scattering angles less than 90, what does that tell you about the sign of the nucleus?
It means it can be both.
Thanks
0
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