A 12.5 MeV alpha particle approaching a gold nucleus is deflected by 180 degrees. What is the closest distance to which it approaches the nucleus?

Dear Student ,
The closest distance of approach is given by ,
d=14πε02e×ZeK.E=9×109×2e×79e12.5×1.6×10-19=9×109×2×79××1.6×10-1912.5=1.82×10-8 m
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