Rutherford scattering formula fails for very small scattering angles because

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the kinetic energy of a-particles is larger

the full nuclear charge of the target atom is partially screened by its electron

the gold foil is very thin

All of the above

answer is C.

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Detailed Solution

According to Rutherford
Scattering angle $\propto \frac{1}{\sin^{4} (θ / 2)}$
It fails for very small scattering angles because the full nuclear charge of the target atom is partially screened by its electron.

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