You have a cold gas of atoms, and you observe that if you shine light consisting

Question

You have a cold gas of atoms, and you observe that if you shine light consisting of photons with energy 12.1 eV through the gas some free electrons are observed due to these photons ionizing the atoms. The emutted electrons have kinetic energy of 0.4 eV. What was the ground state energy (K + U) of these atomic electrons? A 3 kg mass and a 1 kg mass and a 1 kg mass are pushed together with a spring (of negligible mass) between them. They are then released and the spring pushes them apart, in outer space where no friction or other forcess are present.

Explanation / Answer

The ground state energy is the addition of kinetic and potential energy K+U, the problem gives you both value so teh answer is K+U=12.5 eV

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