Question

In the Rutherford scattering experiment, $\frac{1}{20000}$ of the alpha particles is deflected back at an angle of ${180}^{\circ }$. This leads to the conclusion that:

• A. Atom consists of positively charged mass at the centre
• B. It leads to the discovery of the nucleus
• C. Almost the entire mass of the atom is from the nucleus
• D. All of the above

Answer 1

The correct option is D All of the above

The alpha particle is postively charged and in order for it to deflect , the nucleus must also be positively charged, since the like charges repel each other. Rutherford called this postively charged body as nucleus. Since it is able to deflect alpha particle, the nucleus must be heavy and hence almost the entire mass of the atom comes from the nucleus.