Match List – I (Fundamental Experiment) with List – II (its conclusion) and select the correct option from the choices given below the list :
| List-I | List-II |
| (A) Franck-Hertz Experiment. | (i) Particle nature of light |
| (B) Photo-electric experiment. | (ii) Discrete energy levels of atom |
| (C) Davison-Germer Experiment | (iii) Wave nature of electron |
| (iv) Structure of atom |
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The Franck-Hertz experiment demonstrated that atoms absorb energy in discrete quanta, proving (A) → (ii) Discrete energy levels of atom.
The Photoelectric effect, explained by Einstein, showed that light behaves as particles (photons), proving (B) → (i) Particle nature of light.
The Davisson-Germer experiment confirmed de Broglie's hypothesis by observing electron diffraction, proving (C) → (iii) Wave nature of electron.
Therefore, the correct matching is: (A) → (ii), (B) → (i), (C) → (iii).