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At very high temperatures the extrinsic semi conductors become intrinsic because
  • a)
    drive in diffusion of dopants and carriers
  • b)
    band to band transition dominants over impurity ionization
  • c)
    impurity ionization dominants over band to band transition
  • d)
    band to band transition is balanced by impurity ionization
Correct answer is option 'B'. Can you explain this answer?
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At very high temperatures the extrinsic semi conductors become intrins...
Covalent bonds are broken.
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At very high temperatures the extrinsic semi conductors become intrins...
At very high temperatures, the extrinsic semiconductors become intrinsic due to the dominance of band-to-band transitions over impurity ionization. This transition occurs because of the increased thermal energy that allows electron-hole pairs to be generated without the influence of impurities.

Explanation:
- High temperatures provide sufficient thermal energy to excite electrons from the valence band to the conduction band, creating electron-hole pairs.
- In extrinsic semiconductors, impurity ions (dopants) are added intentionally to control the conductivity. These dopants introduce additional energy levels within the band gap, either above or below the intrinsic energy levels.
- At lower temperatures, the majority of the electrons and holes are generated by the ionization of the dopants. This means that impurity ionization dominates the generation of charge carriers, and the semiconductor remains extrinsic.
- However, at very high temperatures, the thermal energy is sufficient to excite electrons from the valence band to the conduction band directly, without the need for ionization of impurity dopants.
- This band-to-band transition dominates the generation of electron-hole pairs, and the semiconductor behaves more like an intrinsic semiconductor.
- Intrinsic semiconductors are pure semiconducting materials without any intentional impurities. They have their own energy levels within the band gap due to the crystal lattice structure.
- When extrinsic semiconductors become intrinsic at high temperatures, it means that the majority of the charge carriers are generated through band-to-band transitions, rather than the ionization of impurities.
- This transition is significant because it affects the electrical conductivity and other properties of the semiconductor material.
- It is important to note that this transition is only valid for very high temperatures, as at lower temperatures, the influence of impurities becomes dominant again.

In summary, at very high temperatures, extrinsic semiconductors become intrinsic due to the dominance of band-to-band transitions over impurity ionization. The increased thermal energy allows for the direct generation of electron-hole pairs without the need for dopant ionization.
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it depends on the length of the conductor the capacitance of the line is proportional to the length of the transmission line their effect is negligible on the performance of short having a length less than 80 km and low voltage transmission accidents of the transmission line along with the conductances forms the shunted mittens the conductance and the transmission line is because of the leakage over the surface of the conductor considered a line consisting of two conductors and be each of radius are the distance between the conductors being Des shown in the diagram below minus the potential difference between the conductors and via's work QA charge on conductor QB charge on conductor vvab pencil difference between conductor and the Epsilon minus absolute primitivity QA plus QV = 0 so that QA equals QB - equals DBA equals data equals DB equals our substituting these values and voltage equation we get the capacitance between the conductors is cab is referred to as lying to line capacitance if the two conductors are in VR oppositely charge then the potential difference between them is zero then the potential of each conductor is given by one half bath the capacitance between each conductor and point of zero potential and is capacitive CN is called the capacitance to neut or capacitance to ground capacitance cab is the combination of two equal capacity and VN series thus capacitance to neutral is twice the capacitance between the conductors IE CN equals to Cave the absolute primitivity Epsilon is given by Epsilon equals epsilono Epsilon are where epsilano is the permittivity of the free space and Epsilon or is the relative primitivity of the medium prayer capacitance reactants between one conductor and neutral capacitance of the symmetrical three phase line let a balanced system of voltage be applied to a symmetrical three-phase line shown below the phasor diagram of the three phase line with equilateral spacing is shown below take the voltage of conductor to neutral as a reference phaser the potential difference between conductor and we can be written the similarly potential difference between conductors and sea is on adding equations one and two we get also combining equation three and four from equation 6 and 7 the line to neutral capacitance the capacitance of symmetrical three phase line is same as that of the two wire line Related: Capacitance of Transmission Lines?

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At very high temperatures the extrinsic semi conductors become intrinsic becausea)drive in diffusion of dopants and carriersb)band to band transition dominants over impurity ionizationc)impurity ionization dominants over band to band transitiond)band to band transition is balanced by impurity ionizationCorrect answer is option 'B'. Can you explain this answer?
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