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Calculation of the diameter of a nucleus

Exploitation of Rutherford's experiment

Remember the interpretation of Rutherford's experiment:

If we count the number of impacts of $\alpha$ particles on the photographic paper, we notice that only one particle in $10000$ is deviated by the nucleus. The gold leaflet had $10000$ gold atoms in thickness. Let's calculate the diameter of a gold nucleus !

→  The experiment

→  Interpretation