Physics

Problem

A proton–electron pair in empty space has an electric potential energy of

-1.6\times10^{-18}\,\text{J}

. What is the separation

r

between the particles at that instant? a)

9.0\times10^{-11}\,\text{m}

1.4\times10^{-10}\,\text{m}

1.4\times10^{-9}\,\text{m}

7.2\times10^{-11}\,\text{m}