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Question

During Rutherford's experiment some of the alpha-particles were deflected by the foil by small angles. What does this prove?


A

There is a positively charged body present in the atom.

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B

Alpha-particles move in a straight line.

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C

Alpha-particles are not electrically charged.

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D

Atom is very large in size.

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Solution

The correct option is A i.e There is a positively charged body present in the atom.

In Rutherford’s alpha ray scattering experiment, the alpha rays are incident on a very thin gold foil. It was observed that many alpha particles passed through the gold foil but one out of every 20,000 reflected back at small angles.

So, Rutherford made a few conclusions from the observations. They are:

a. As many of the rays are going the foil undeflected most of the atom must be hollow.

b. Few rays coming out were highly deflected, indicating the presence of positive charge and that it occupied a very little volume of the atom.

c. After many calculations, Rutherford found that the size of the nucleus was 105 times smaller than the atom.


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