Step 1: Understanding the Concept:
This question covers the dual nature of radiation and matter, mapping mathematical expressions and physical phenomena to their underlying theories.
Step 2: Detailed Explanation:
• A $\rightarrow$ IV: $E = h\nu$ is the fundamental equation for the Energy of a photon, where $h$ is Planck's constant.
• B $\rightarrow$ III: Diffraction and Interference are phenomena that can only be explained if light is treated as a wave.
• C $\rightarrow$ I: $\lambda = h/p$ is the de Broglie wavelength formula, relating the momentum of a particle to its wavelength.
• D $\rightarrow$ II: The Compton effect involves the scattering of a photon by an electron, providing definitive proof for the particle nature of light.
Step 3: Final Answer:
The correct matching is A-IV, B-III, C-I, D-II.