Define the distance of closest approach- An alpha-particle of kinetic energy -K- is bombarded on a thin gold foil- The distance of the closest approach is -r- What will be the distance of closest approach an alpha -particle of double the kinetic energy -

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Define the distance of closest approach, An α-particle of kinetic energy ′K′ is bombarded on a thin gold foil. The distance of the closest approach is ′r′. What will be the distance of closest approach for an α -particle of double the kinetic energy ?

Define the distance of closest approach, An $α$ -particle of kinetic energy $^{'} K^{'}$ is bombarded on a thin gold foil. The distance of the closest approach is $^{'} r^{'} .$ What will be the distance of closest approach for an $α$ -particle of double the kinetic energy ?