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Q.

In the Geiger-Marsden scattering experiment, find the distance of closest approach to the nucleus of a 7.7Mev α-particle before it comes momentaily to rest and reverses its direction.
(‘Z’ for gold nucleus = 79 )

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a

10 fm

b

20 fm

c

30 fm

d

40 fm

answer is C.

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Detailed Solution

12mv2=14πϵ0q1q2r07.7×1.6×10−13=9×109×79×1.6×10−19×2×1.6×10−19r0r0=29.55 fm≈30 fm

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