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I need the answer as soon as possible Q. 6. a - particles from a polonium source strike a thin gold foil of thickness 4

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Q. 6. a - particles from a polonium source strike a thin gold foil of thickness 4 x 10-7 m. Most of the particles scatter in the forward direction but (1/6-17 X 106) fraction of a - particles are found to be scattered by more than 90. Find the cross-section of this type scattering if the number of gold nuclei per unit volume is 5.9 x 1028 per meter)

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