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  4. Which type of collision shown by photon-electron collision in photoelectric effect?

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Q. Which type of collision shown by photon-electron collision in photoelectric effect?

Dual Nature of Radiation and Matter

Solution:

Photon - electron collision is an example of elastic collision because energy conservation takes place i.e. energy of photon absorbs by the electron to emit within $10^{-9}$ sec time lapse.