A photon of energy collides inelastically with a stationary hydrogen atom in its…

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A photon of energy

10.2\,\text{eV}

collides inelastically with a stationary hydrogen atom in its ground state. After a time interval of the order of a microsecond, another photon of energy

15\,\text{eV}

collides inelastically with the same hydrogen atom. What will be observed by the detector? (1) 2 photons of energy

10.2\,\text{eV}

(2) 2 photons of energy

1.4\,\text{eV}

(3) One photon of energy

10.2\,\text{eV}

and an electron of energy

1.4\,\text{eV}

(4) One photon of energy

10.2\,\text{eV}

and another photon of energy

1.4\,\text{eV}

Related theory

Atomic Spectra
Atomic Models
Atomic physics
Hydrogen spectral series
Energy levels and line spectra of hydrogen
Atoms

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