An alpha particle approaches a gold nucleus ...

CBSE Class 12 Physics 2024 All Sets Solved Paper

Question : 10 of 14

Marks: +1, -0

An alpha particle approaches a gold nucleus in Geiger-Marsden experiment with kinetic energy K. It momentarily stops at a distance d from the nucleus and reverses its direction. Then d is proportional to:

$\; \frac{1}{\sqrt{K}}$
$\sqrt{K}$
$\; \frac{1}{K}$
K

Solution:

K.E. = P.E.

K.E. = 2e \left( \; \frac{KZe}{r} \right)

r = \; \frac{2KZe^2}{K.E}

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