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In a photon-particle collision, what may not be conserved?
ANucleus of the atom
BNeutral total energy
CNumber of photons
DNature of momentum
Answer & Solution
Correct answer: C. Number of photons
1. Total energy and total momentum are always conserved.
2. However, the number of photons may not be conserved in a collision.
3. A photon may be absorbed, or a new photon created.
_Source: NCERT Class 12 Physics Part II, Ch 11 'Dual Nature of Radiation and Matter'_
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