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An electron of kinetic energy 100 eV collides with a stationary helium ion He in...

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An electron of kinetic energy 100 eV collides with a stationary helium ion He in its ground state and excites it to a higher level After collision He ion emits two photons in succession with wavelengths 1085 A and 304 A Find the kinetic energy of electron after collision Neglect the recoil speed of He ion

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An electron of kinetic energy 100 eV collides with a stationary helium ion He in its ground state and excites it to a higher level After collision He ion emits two photons in succession with wavelengths 1085 A and 304 A Find the kinetic energy of electron after collision Neglect the recoil speed of He ion

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