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for scattering by an inverse square law field (such as that produced by a charged nucleus in Rutherford's model), the relation between impact parameter b and the scattering angle `theta` is given by
`b=(Ze^2 cot theta//2)/(4pi in_0(1/2mv^2))`
(a) What is the scattering angle for b=0?
(b) for given impact parameter, b, does the angle of deflection increase or decrease with increase in energy?
(c) What is the impact parameter at which the scattering angle is `90^@` for Z=79 and initial energy=10MeV?
(d) Why is it that the mass of the nucleus does not enter the formula above, but its charge does?
(e) for a given energy of the projectile, does the scattering angle increase or decrease with decrease in impact parameter?

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