Home CBSE CBSE CLASS 12 PHYSICS TERM-2 SYLLABUS 2021-2022

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# Term II (Theory)

### 2021-2022

Time: 2 Hours                                                                                                                                            Max Marks: 35

 S.NO CHAPTER-WISE No of Periods Marks Unit–V Electromagnetic Waves 02 17 Chapter–8: Electromagnetic Waves Unit–VI Optics 18 Chapter–9: Ray Optics and Optical Instruments Chapter–10: Wave Optics Unit–VII Dual Nature of Radiation and Matter 07 11 Chapter–11: Dual Nature of Radiation and Matter Unit–VIII Atoms and Nuclei 11 Chapter–12: Atoms Chapter–13: Nuclei Unit–IX Electronic Devices 07 7 Chapter–14: Semiconductor -Electronics: Materials, Devices and Simple Circuits Total 45 35

## CHAPTER WISE

### Unit V:  ELECTROMAGNETIC WAVES                                                                          2 Periods

Chapter–8: Electromagnetic Waves

• Electromagnetic waves, their characteristics, their Transverse nature (qualitative ideas only).
• Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays) including elementary facts about their uses.

### Unit VI: OPTICS                                                                                                                      18Periods

Chapter–9: Ray Optics and Optical Instruments

Ray Optics:

• Refraction of light, total internal reflection and its applications, optical fibres, refraction at spherical surfaces, lenses, thin lens formula, lensmaker’s formula, magnification, power of a lens, a combination of thin lenses in contact, refraction of light through a prism.
• Optical instruments: Microscopes and astronomical telescopes (reflecting and refracting) and their magnifying powers.

### Chapter–10: WAVE OPTICS

Wave optics:

• Wavefront and Huygen’s principle, reflection and refraction of plane wave at a plane surface using wavefronts. Proof of laws of reflection and refraction using Huygen’s principle.
• Interference, Young’s double-slit experiment and expression for fringe width, coherent sources and sustained interference of light, diffraction due to a single slit, width of central maximum.

### Unit VII:  DUAL NATURE AND RADIATION OF MATTER                                   7 Periods

Chapter–11: Dual Nature of Radiation and Matter

• Dual nature of radiation, Photoelectric effect, Hertz and Lenard’s observations; Einstein’s photoelectric equation-particle nature of light.
• Experimental study of the photoelectric effect. Matter waves-wave nature of particles, de-Broglie relation

### Unit VIII: ATOMS AND NUCLEI                                                                                       11Periods

Chapter–12: Atoms

Alpha-particle scattering experiment; Rutherford’s model of atom; Bohr model, energy levels, hydrogen spectrum.

Chapter–13: Nuclei

Composition and size of nucleus Nuclear force Mass-energy relation, mass defect, nuclear fission, nuclear fusion.

### Unit IX: ELECTRONIC DEVICES                                                                                      7 Periods

Chapter–14: Semiconductor Electronics: Materials, Devices and Simple Circuits Energy bands in conductors, semiconductors and insulators (qualitative ideas only) Semiconductor diode – I-V characteristics in forward and reverse bias, diode as a rectifier; Special purpose p-n junction diodes: LED, photodiode, solar cell.