An electron and proton are separated by a large distance. The electron starts approaching the proton with energy $3 ext{ eV}$. The proton captures the electrons and forms a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength $4000 ext{ Å}$. What is the maximum kinetic energy of the emitted photoelectron?

Question

An electron and proton are separated by a large distance. The electron starts approaching the proton with energy $3 	ext{ eV}$. The proton captures the electrons and forms a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength $4000 	ext{ Å}$. What is the maximum kinetic energy of the emitted photoelectron?

Accepted Answer

1.41 eV

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