Physics
Modern Physics for Class 12: Dual Nature, Atoms and Nuclei
By Dr. Sandhya Classes Editorial Team · Published 2026-10-03 · Updated 2026-10-03 · 3 min read
Photoelectric effect, Bohr model, nuclear physics and semiconductors explained clearly.
Physics at Dr. Sandhya Classes is taught personally by Dr. Sandhya, Ph.D. in Physics, teaching since 2015 — offline in Zirakpur (Highland Marg & Lohgarh Road) and online across India. About Dr. Sandhya
Dual nature of radiation and matter
The photoelectric effect shows light behaving as particles; de Broglie waves show matter behaving as waves.
Atomic models
Bohr's model explains hydrogen spectra; practise energy-level calculations.
Nuclei
Mass defect, binding energy, fission and fusion are high-scoring when understood conceptually.
Semiconductors
Diodes and their applications need clear diagrams and characteristic curves.
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