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Match each law or process in List-I with the physical phenomenon in List-II that it is most directly associated with. List-I (A) Transition between two atomic energy levels (B) Electron emission from a material (C) Moseley's law (D) Conversion of photon energy into kinetic energy of electrons List-II (P) Characteristic X-rays (Q) Photoelectric effect (R) Hydrogen spectrum (S) Beta decay

1. A->PR, B->QS, C->P, D->Q
2. A->QS, B->PR, C->P, D->Q
3. A->PR, B->QS, C->Q, D->P
4. A->QR, B->RS, C->Q, D->P

Correct answer: A->PR, B->QS, C->P, D->Q

Solution

Atomic energy-level transitions produce both characteristic X-rays (P) and the hydrogen spectrum (R). Electron emission occurs in the photoelectric effect (Q) and beta decay (S). Moseley's law specifically governs characteristic X-ray frequencies (P). Photon-to-KE conversion defines the photoelectric effect (Q).

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