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RELATION BETWEEN PHASE VELOCITY AND GROUP VELOCITY

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February 16, 2023

RELATION BETWEEN PHASE VELOCITY AND GROUP VELOCITY

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Photoelectric effect

February 09, 2023

Photoelectric effect photo means photons (light particle) light speed 3*10^8 m/s electric means electricity VISIBLE LIGHT VIBGYOR NON VISIBLE UV RAY INFRADE RAY ALWAYS DEPEND METAL SURFACE EX ALKALI METALS group 01 11 Na 19 K 37 Rb 55Cs 87Fr (visible light ) not alkali metal Ex Al Zn USE UV RAY NON METAL EXTERIME UV RAY Photoelectric effect DEFINNATION When a light of suitable frequency is incident on a surface of metal then the electrons are emitted from metal surface. This phenomenon is known as photoelectric effect . Threshold frequency is defined as the minimum ...

The de Broglie Hypothesis

February 11, 2023

The de Broglie Hypothesis Since light seems to have both wave and particle properties, it is natural to ask whether matter (electrons, protons) might also have both wave and particle characteristics. In 1924, a French physics student, Louis de Broglie, suggested this idea in his doctoral dissertation. For the wavelength of electron, de Broglie chose: h= plank's constant (6.63*10^-34 j.s) m = mass v= velocity E=pc=hv=hc/lambda light two types 1. PARTICLE 2.WAVE 1. particle photoelectric effect E k = hf − ϕ Compton Effect λ′−λ=...