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In the Rutherford's experiment, a partic...

In the Rutherford's experiment, a particles were bombarded towards the copper atoms so as to arrives a distance of `10^(-13)` metre from the nucleus of copper and then getting either deflected or traversing back. The a-particles did not move further closer
The velocity of the a-particles must be

A

`N alpha sin (+(theta)/(2))`

B

`N(d sigma)/(d Omega) alpha (1)/(sin^(4)theta)`

C

`N(d sigma)/(d Omega) alpha (1)/(sin^(4)(theta//2))`

D

`N = sin.(theta)/(2)`

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The correct Answer is:
C
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