1. Tardigrade
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  3. Physics
  4. The observations of Geiger-Marsden experiment are I. Many of α particles pass straight through the gold foil. II. Only about 0.14 % of α-particles scatter by more than 1° III. About 1 in 8000 of α-particles is deflected more than 90°. IV. Very few particles are reflected back.

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Q. 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.

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Solution:

Many of the $\alpha$-particles pass through the foil. It means that they do not suffer any collisions.
image
Only about $0.14 \%$ of the incident $\alpha$-particles scatter by more than $1^{\circ}$ and about $1$ in $8000$ deflected by more than $90^{\circ} .32$.