ORIGIN OF QUATUM PHYSICS Vs CLASSICAL PHYSICS

OR WAVE PARTICLE DUALITY DUAL NATURE OF LIGHT OR WAVE PARTICLE DUALITY

Optical Concepts: INTERFERENCE DIFFRACTION POLARIZATION

OTHER Concepts: BLACK BODY RADIATION PHOTOELECTRIC EFFECT EMISSION & ABSORPTION

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.

PHOTELECTRIC EFFECT:

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

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)

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

DE- Broglie wave OR Matter wave

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