ciara.jm
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In Physics we have been doing about how the Alpha Particle Experiment was to see if the Plum Pudding Model was correct. The textbook says that the people carrying out the Alpha Particle Experiment Expected the Positive Alpha Particles to pass Straight through the Atom. However this doesn’t make sense because the Plum Pudding Model stated that the Atom was a Ball of Positive Charge with Electrons. This Would Mean that they Should’ve Expected All the Particles to Be Deflected.
Can Anyone Explain How the Textbook is Correct?
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Joinedup
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(Original post by MissC_2019)
In Physics we have been doing about how the Alpha Particle Experiment was to see if the Plum Pudding Model was correct. The textbook says that the people carrying out the Alpha Particle Experiment Expected the Positive Alpha Particles to pass Straight through the Atom. However this doesn’t make sense because the Plum Pudding Model stated that the Atom was a Ball of Positive Charge with Electrons. This Would Mean that they Should’ve Expected All the Particles to Be Deflected.
Can Anyone Explain How the Textbook is Correct?
The surprise was that a small proportion of the alpha particles came back at really large angles, nearly 180 degrees to their initial path - the plum pudding could not explain the large angle deflections.
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username3442196
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I always thought in the Plum Pudding Model the atom is full of mixed + and - charges (basically a neutral volume), so there isn't a concentrated volume of just positive charge which is needed to explain the large deflections observed.
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ciara.jm
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(Original post by Joinedup)
The surprise was that a small proportion of the alpha particles came back at really large angles, nearly 180 degrees to their initial path - the plum pudding could not explain the large angle deflections.
Thankyou, I just don’t understand why Rutherford EXPECTED the Positive Alpha Particles to Pass Through the Positive Charge?
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Joinedup
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(Original post by MissC_2019)
Thankyou, I just don’t understand why Rutherford EXPECTED the Positive Alpha Particles to Pass Through the Positive Charge?
He thought the +ve and -ve charges were spread out uniformly in a sphere the size of a gold atom.

remember the gold atom is very much bigger than the nucleus so there would have been no particularly concentrated lumps of charge or mass in a plum pudding atom. it was unexpected that you could stick similar charges together in a compact nucleus - the coulomb force of repulsion would have been huge
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ciara.jm
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(Original post by Joinedup)
He thought the +ve and -ve charges were spread out uniformly in a sphere the size of a gold atom.

remember the gold atom is very much bigger than the nucleus so there would have been no particularly concentrated lumps of charge or mass in a plum pudding atom. it was unexpected that you could stick similar charges together in a compact nucleus - the coulomb force of repulsion would have been huge
Thankyou!!
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