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Calculate the electrostatic potential energy at the instant when the alpha particle stops?

1. \( 36.3 \mathrm{MeV} \)
2. 45.0 MeV
3. \( 3.63 \mathrm{MeV} \)
4. 40.0 Mev

Correct answer: \( 36.3 \mathrm{MeV} \)

Solution

When the alpha particle stops momentarily, its kinetic energy is zero, so the electrostatic potential energy equals the initial kinetic energy. Therefore the potential energy at that instant is 36.3 MeV.

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