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The process where excess charge from a body or object goes to ground, by touching the charge carrying conducting body to earth is called earthing or grounding.
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Yogita Ingle 6 years, 1 month ago
The holes lie in the valence band, while the free electrons are in the conduction band. When there is a forward bias in the p-n junction, the electron which is a part of the n-type semiconductor material would overrun the p-n junction and join with the holes in the p-type semiconductor material. Therefore regarding the holes, the free electrons would be at the higher energy bands.
When this movement of free electron and hole takes place, there is a change in the energy level as the voltage drops from the conduction band to the valance band. There is a release of energy due to the motion of the electron. In standard diodes, the release of energy in the manner of heat. But in LED the release of energy in the form of photons that would emit the light energy. The entire process is known as electroluminescence, and the diodes are known as a light-emitting diode.
In LED, energy discharged in light form hinges on the forbidden energy gap. One could manipulate the wavelength of the light produced. Therefore, from its wavelength, the light colour and its visibility or cannot be controlled. The colour and wavelength of the light emitted can be determined by doping it with several impurities.
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Yogita Ingle 6 years, 1 month ago
Law of Malus : According to Malus, when completely plane polarised light is incident on the analyser, the intensity I of the light transmitted by the analyser is directly proportional to the square of the cosine of angle between the transmission axes of the analyser and polarizer i.e {tex}I \alpha co{{s}^{2}}\theta. {/tex}
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Yogita Ingle 6 years, 1 month ago
- Ampere’s circuital law states that line integral of magnetic field forming a closed loop around the current(i) carrying wire, in the plane normal to the current, is equal to the μo times the net current passing through the close loop.
Here μo = permeability of free space = 4π×10-15N/A2
- This law is based on the assumption that the closed loop consists of small elemental parts of length dl, and the total magnetic field of the closed loop will be the integral of magnetic field and the length of these elements
This closed loop is called Amperian loop
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Yogita Ingle 6 years, 1 month ago
- In case of microscope resolving power helps to magnify the image.
- Resolution helps to distinguish between the small similar particles of an object when they are so closely placed with each other.
- When the distance between 2 points is comparable to the wavelength then diffraction occurs.
- Image formed due to the diffraction pattern vθ = v (22λ/D).
Posted by Sneha Chattaraj 6 years, 1 month ago
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Himanshu Mishra 6 years, 1 month ago
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Jk Verma 6 years, 1 month ago
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