Question

In Rutherford's alpha particle scattering experiment, what was the percentage (approx.) of the incident $\alpha -$particles scatter by more than $1^{\circ }?$

• A. $0.14$
• B. $1.4$
• C. $8.4$
• D. $7$

Answer 1

The correct option is A $0.14$

In Rutherford's scattering experiment, a piece of thin gold foil was bombarded with alpha particles. It was observed that some of the alpha particles suffered a large deflection (more than ${90}^{\circ }$) and some were even deflected by ${180}^{\circ }$.
Since, very few particles suffered this large deflection i.e. less than or equal to $0.14\text{\%}$ of alpha particles scatter more than $1^{\circ }$, it implied that the mass was present in a very small area inside an atom.
This mass was called the nucleus.
Hence, $\left(A\right)$ is correct answer.