Photoelectric Effect and Einstein's Explantion
ฝัง
- เผยแพร่เมื่อ 20 ก.ย. 2024
- Particle nature of light and how Albert Einstein used his theory & concept of Work Function to explain photoelectric effect.
We see how did Einstein find similarity between the mathematics of kinetic theory of gases and Planck’s derivation of Blackbody radiation. That inspired him to believe that light is made up of small particles like gas molecules.
Based on this, he gave his particle theory of light:
• Light is train of particles or discrete quanta called photons. Each photon has energy, E = hf. Here “h” is Planck’s constant and “f” is frequency of wave.
• Light quanta are emitted or absorbed on an all or nothing basis
• A light quantum when absorbed by a metal delivers its entire energy to one electron.
• There is a minimum energy required to free an electron from any metal. This is called as Work Function. If energy is less than work function, electrons are not emitted. Work Function depends on the material.
Based on these postulates, he was able to explain all the below experiments results of Photoelectric effect:
• Minimum or a threshold frequency below which the photoelectric emission doesn’t happen.
• Individual energy of the emitted electrons doesn’t depend on the intensity of the light. It depends on the frequency
• Instantaneous emission of electrons when threshold frequency is shone on a metal
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Issliye space me jo gases hoti hai unke pass electrons nhi ho sakta
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Sir, I have a question about 'how Einstein explained intensity or amplitude (in wave theory) of incoming light w.r.t. photo electric affect ?
Where the total energy goes/ interact?
Why cell/battery are also shown in figure of work function?
लाजवाब
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decreased wavelength .... so increase in momentum.
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does photo e.e. happens only with Metals or not why??
Yes..only metal has valence electrons to emit
@@indranilkarmakar6712 but non metals also have valence orbitals and electrons
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1st comment
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