In a photon-particle collision (such as photon-electron collision) the quantity which is not conserved isa)total momentumb)number of photonsc)total energyd)None of the aboveCorrect answer is option 'B'. Can you explain this answer?

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Energy and momentum are conserved, resulting in a reduction of both for the scattered photon. ... This phenomenon could be handled as a collision between two particles—a photon and an electron at rest in the material. Energy and momentum are conserved in the collision.

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Answer  B is correct

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Hii its simple take the case of photoelectric effect only you will be easily observing that all the no of photons targeting the foil do not ejects out the photoelectrons. so the no of photon does not remain conserved........

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Photon-Particle Collision: Conservation Laws

Number of Photons not conserved
In a photon-particle collision, the number of photons involved in the interaction is not conserved. This is because the collision can result in the creation or annihilation of photons, leading to a change in the total number of photons present before and after the collision.

Total Momentum, Total Energy Conserved
- Total momentum and total energy are conserved in a photon-particle collision.
- Conservation of momentum ensures that the total momentum of the system before the collision is equal to the total momentum after the collision, considering both the particles involved.
- Conservation of energy ensures that the total energy of the system remains constant throughout the collision process.

Implications of Non-conservation of Number of Photons
The non-conservation of the number of photons in a photon-particle collision can have significant implications for the outcome of the interaction. For example, in processes such as pair production or annihilation, photons can be converted into particle-antiparticle pairs or vice versa, leading to a change in the total number of photons.

Conclusion
In summary, while total momentum and total energy are conserved in a photon-particle collision, the number of photons involved in the interaction is not conserved. This makes photon-particle collisions unique in terms of the conservation laws that govern them.

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