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The following text gives a qualitative i...

The following text gives a qualitative idea about Rutherford's `alpha-` particle scattering experiment.

Applying some trigonometry and calculus, Rutherford got the following equation:
`cot ((0)/(2)) = (Kxx(KE))/(Ze^(2))xxb`
`"where", K= "constant" =((1)/(9xx10))(c^(2))/(N-m^(2))`
KE = initial kinetic energy of `alpha-`particle,
`e=1.6xx10^(-19)C`
In an experment with gold nucleus (assume Z=80) with impact parameter equal to `10^(-4)m` the scattering angle was found to be `90^(@),` What should be the initial KE of `alpha-`particle?

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