Class 12

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Q1.

An elementary particle of mass $m$ and charge $+e$ is projected with velocity $v$ at a much more massive particle of charge $Ze,$ where $Z \gt 0.$ What is the closest possible approach of the incident particle?

(A)

$\frac{Ze^2}{2\pi \varepsilon_0 mv^2}$

(B)

$\frac{Ze}{4\pi \varepsilon_0 mv^2}$

(C)

$\frac{Ze^2}{8\pi \varepsilon_0 mv^2}$

(D)

$\frac{Ze}{8\pi \varepsilon_0 mv^2}$

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Q2.

The Rutherford $\alpha$-particle experiment shows that most of the $\alpha$-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom?

(A)

Atom is hollow

(B)

The whole mass of the atom is concentrated in a small centre called nucleus

(C)

Nucleus is positively charged

(D)

All the above

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