An electron and a proton are seperated by a large distance and the electorn approaches the proton with a kinectic energy of 2 eV. If the electron is captured by the proton to form a hydrogen atom in the ground state, what wavelength photon would be given off?

Answer

C

Explanation

Energy of electron in ground state of hydrogen
atom is -13.6 eV. Earlier it had a kinetic energy of 2 eV. Therefore, energy of
photon released durig
formation of hydrogen atom,
`DeltaE = 2 - (-13.6) = 15.6 eV`
`:gt lambda = (12375)/(DeltaE) = (12375)/(15.6)`
=793.3 Å`