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ORIGIN OF QUATUM PHYSICS

Explore the origin of quantum physics and its distinction from classical physics. Delve into the concepts of wave-particle duality, interference, diffraction, polarization, black body radiation, and the photoelectric effect. Discover the De Broglie wave and the correlation between wave-like and particle-like properties through Planck's constant.

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ORIGIN OF QUATUM PHYSICS

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  1. ORIGIN OF QUATUM PHYSICS Vs CLASSICAL PHYSICS

  2. DUAL NATURE OF LIGHT OR WAVE PARTICLE DUALITY

  3. Optical Concepts: • INTERFERENCE • DIFFRACTION • POLARIZATION

  4. OTHER Concepts: • BLACK BODY RADIATION • PHOTOELECTRIC EFFECT • EMISSION & ABSORPTION

  5. BLACK BODY RADIATION: • A black body is an ideal body which allows the whole of the incident radiation to pass into itself ( without reflecting the energy ) and absorbs within itself this whole incident radiation (without passing on the energy). This propety is valid for radiation corresponding to all wavelengths and to all angels of incidence. Therefore, the black body is an ideal absorber of incident radaition.

  6. PHOTELECTRIC EFFECT:

  7. The setup • An adjustable voltage is applied. Voltage can be forward or reverse biased (which slows down the electrons) • Photoelectrons return to cathode through an ammeter which records the current

  8. Some experimental results: • If photoelectrons get ejected when you shine monochromatic light on the target, the current increases when you increase the intensity (brighter light = more photoelectrons)

  9. Parting question... So is light a particle? Or is light a wave?

  10. DE- Broglie wave OR Matter wave

  11. Planck’s constant Relation between Wave like & Particle like property is given by de Broglie wavelength

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