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What is the use of platinum foil in an S...

What is the use of platinum foil in an `SHE` ?

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It is used for inflow and outflow of electrons .
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A narrow beam of alpha particles falls normally on a silver foil behind which a counter is set to register the scattered particles. On substraction of platinum foil of the same mass thickness for the silver foil, the number of alpha particles registered per unit time increased eta= 1.52 time s . Find the atomic number of platinum, assuming the atomic number of silver and the atomic masses of both platinum and silver to be known.

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