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Thomson and Rutherford's experiments

  • Thread starter Westin
  • Start date
87
0
1. Homework Statement
If Thomson's "plum pudding" model was correct, what could have happened when Rutherford fired high energy alpha particles at gold foil?


Select all that are True.
Alpha particles are reflected.
Alpha particles pass right through with no deflection.
Alpha particles experience small deflections.
Alpha particles experience large deflections.



2. Homework Equations
None

3. The Attempt at a Solution

I understand Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom. Also, how Rutherford's Gold Foil Experiment proved the existance of a small massive center to atoms, which would later be known as the nucleus of an atom.

Wouldn't this mean Alpha particles would pass right through with no deflection since a nucleus hasn't been established yet?
 

pitbull

Gold Member
25
1
I believe the right answer is
Alpha particles pass right through with no deflection.
 
87
0
That is what I tried and it was wrong :(
 

andrevdh

Homework Helper
2,126
116
The positive nuclei have the largest mass and would then be evenly distributed throughout the "pudding".
How would such a distribution influence the deflection?
The large deflection observed in the real experiment came about as a result of the nuclei being bound together in one large concentrated mass.
 

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