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A narrow beam of alpha particles with ki...

A narrow beam of alpha particles with kinetic energy `1.0 MeV` falls normally on a platinum foil `1.0 mu` thick. The scattered particles are observed at an angle of `60^(@)` to the incident beam direction by means of a counter with a circular inlet area `1.0 cm^(2)` located at the distacne `10 cm`from the scattering section of the foil. What fraction of scattered alpha particles reaches the counter inlet?

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