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A helium atom at 1 MeV is sent into iron. Assuming the electronic stopping cross section is a constant (88 10 -5 eV cm 2

A helium atom at 1 MeV is sent into iron. Assuming the electronic stopping cross section is a constant (88  10-5 eV cm2), what is the energy of the helium atom after it travels 500 nm? If the He atom collides with an Fe atom after traveling 500 nm, what is the maximum energy transferred? Assume an atomic density of 8.5  1022 atoms/cm3 for Fe.

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