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Supitha
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- How can explain the difference of these red dots?
- Red line = Green line ?. How to explain it?
Thank you so much.Swamp Thing said:Even when the applied voltage is zero, there is a kind of "virtual" voltage that pulls the electrons back into the metal. This is called the "work function", I believe.
So at low photon frequencies, there is a smaller chance that an electron will end up with enough energy to leave the metal (because total energy = photon energy + random thermal energy). For high photon energies, there is more chance of escaping i.e. more chance that electron's original thermal energy plus photon energy will carry it over the work function threshold.
No. The second picKizer said:who me?
The photoelectric effect, also known as the Hertz effect, is the phenomenon where electrons are emitted from a material when it is exposed to electromagnetic radiation such as light.
The photoelectric effect played a crucial role in the development of modern physics, as it provided evidence for the particle nature of light and helped to establish the concept of energy quantization. It also has practical applications in devices such as photovoltaic cells and photoelectric sensors.
When a photon of light hits a material, it transfers its energy to an electron in the material. If the energy of the photon is greater than the work function of the material, the electron can overcome the binding energy of the material and be ejected as a photoelectron.
The work function is the minimum amount of energy required for an electron to escape from the surface of a material. It is different for each material and depends on factors such as the type of material and its surface properties.
The number of photoelectrons emitted is directly proportional to the intensity of light. This means that increasing the intensity of light will result in more photoelectrons being emitted, as long as the frequency of the light is above the threshold frequency for the material.