If the barrier potential of the diode shown in the given circuit is \(0.7\,\mathrm{V}\), then the value of the resistance \(R\) is
Show Hint
- \(220\,\Omega\)
- \(150\,\Omega\)
- \(70\,\Omega\)
- \(100\,\Omega\)
The Correct Option is D
Solution and Explanation
Top Questions on Semiconductors
- When a p-n junction diode is forward biased, the:
- CBSE Class XII - 2025
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- A p-type Si semiconductor is made by doping an average of one dopant atom per \( 5 \times 10^7 \) silicon atoms. If the number density of silicon atoms in the specimen is \( 5 \times 10^{28} \, \text{atoms m}^{-3} \), find the number of holes created per cubic centimeter in the specimen due to doping. Also give one example of such dopants.
- CBSE Class XII - 2025
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Extrinsic semiconductors are made by doping pure or intrinsic semiconductors with suitable impurity. There are two types of dopants used in doping, Si or Ge, and using them p-type and n-type semiconductors can be obtained. A p-n junction is the basic building block of many semiconductor devices. Two important processes occur during the formation of a p-n junction: diffusion and drift. When such a junction is formed, a ’depletion layer’ is created consisting of immobile ion-cores. This is responsible for a junction potential barrier. The width of a depletion layer and the height of potential barrier changes when a junction is forward-biased or reverse-biased. A semiconductor diode is basically a p-n junction with metallic contacts provided at the ends for application of an external voltage. Using diodes, alternating voltages can be rectified.
- CBSE Class XII - 2025
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Assertion (A): The impurities in p-type Si are not pentavalent atoms.
Reason (R): The hole density in the valence band in a p-type semiconductor is almost equal to the acceptor density.
- CBSE Class XII - 2025
- Physics
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