In Rutherford’s experiments, on average, one out of 8000 alpha particles changed its direction of motion to the opposite

In Rutherford’s experiments, on average, one out of 8000 alpha particles changed its direction of motion to the opposite. How did Rutherford explain this phenomenon?

Scattering of particles at large angles, according to Rutherford, could occur only if a positively charged particle was repulsed by a massive positive charge concentrated in a very small region of space.

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