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< h1 id = "study-topic-title" style = "font-size: 2.5rem; margin-bottom: 1rem;" > Modern Physics Questions & Formulas
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1. Dual Nature of Matter
Light and matter exhibit both wave and particle properties. Photon energy: E = hf. De Broglie wavelength: λ = h/p.
2. Atomic Structure
Bohr's model explains electron orbits. Radioactive decay follows the law N = N₀ e^(-λt).
3. Mass-Energy Equivalence
Einstein's famous relation: E = mc². This explains energy release in nuclear fission and fusion.