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Gaurav Seth 6 years, 2 months ago
Q value:
During the reaction the amount of energy release or absorbed is known as Q value .Q value given as
Q= 931 ( m - m') MeV
m= Mass of reactant
m'=Mass of product
Mass energy equivalent
Q = Kf - Ki
Where K is kinetic energy of the mass.
So in the reaction Q is equivalent to the K.
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Yogita Ingle 6 years, 2 months ago
Meter bridge is also known as the Slide Wire Bridge. It consists of a wire whose length is one meter and has uniform cross sectional area. Now the wire is stretched along a meter scale. The bridge has two metallic strips which is in reverted L shape on either side of the wire. These metallic strips act as holders for the wire. The wire is being clamped to the strips.These two metallic strips are made up of metals like copper. The bridge consists of another metallic strip which is placed between those two strips with a gap between them. So totally there are five leads on the bridge.
Posted by Vishal Pathak 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
The resonant frequency is also known as resonance frequency which is used in the series circuit when the inductive reactance is equal to the capacitive reactance. The resonant frequency is mathematically given as:
Where,
- f0 is the resonant frequency
- L is the inductance
- C is the capacitance
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Vaibhav Srivastava 6 years, 2 months ago
Yogita Ingle 6 years, 2 months 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.
Vishal Pathak 6 years, 2 months ago
Posted by Mukesh Verma Verma 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
According to Gauss’s law, the total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. The total electric flux through a closed surface is zero if no charge is enclosed by the surface.
- Gauss’s law is true for any closed surface, no matter what its shape or size.
- The term q on the right side of Gauss’s lawincludes the sum of all charges enclosed by the surface. The charges may be located anywhere inside the surface.
- In the situation when the surface is so chosen that there are some charges inside and some outside, the electric field [whose flux appears on the left side of Eq. (1.31)] is due to all the charges, both inside and outside S. The term q on the right side of Gauss’s law, however, represents only the total charge inside S.
- The surface that we choose for the application of Gauss’s law is called the Gaussian surface. The Gaussian surface can pass through a continuous charge distribution.
- Gauss’s law is useful for the calculation of the electrostatic field for a symmetric system.
- Gauss’s law is based on the inverse square dependence on distance contained in the Coulomb’s law. Any violation of Gauss’s law will indicate departure from the inverse square law.
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Yuvraj Singh 6 years, 2 months ago
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