Question

The observations of Geiger-Marsden experiment are
I. Many of $\alpha$ particles pass straight through the gold foil.
II. Only about $0.14\%$ of $\alpha$-particles scatter by more than $1^{\circ }$
III. About $1$ in $8000$ of $\alpha$-particles is deflected more than $90^{\circ }$.
IV. Very few particles are reflected back.

• A. I, II and IV
• B. I, II and III
• C. II, III and IV
• D. I, II III and IV

Answer 1

Answer: (D)

Many of the $\alpha$-particles pass through the foil. It means that they do not suffer any collisions.

Only about $0.14\%$ of the incident $\alpha$-particles scatter by more than $1^{\circ }$ and about $1$ in $8000$ deflected by more than $90^{\circ }.32$.