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Explain why elemental semiconductor cann...

Explain why elemental semiconductor cannot be used to make visible LEDs.

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The band gap of elemental semiconductor is such visible region as required in LED s
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MODERN PUBLICATION-SEMICONDUCTOR ELECTRONICS METERIALS DEVICES AND SIMPLE CIRCUITS -NCERT FILE SOLVED (TEXT BOOK EXERCISES )
  1. A p-n photodiode is fabricated from a semiconductor with band gap of...

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  2. The number of silicon atoms per m^(3) is 5xx10^(28). This is doped sim...

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  3. In an intrinsic semiconductor, the energy gap E(g) of an intrinsic sem...

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  4. In a p-n junction diode, the currect I can expressed as I=I(0) exp((eV...

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  5. You are given two circuits as given below show that circuit (a) acts ...

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  6. Write the truth table for a NAND gae connected as given in the follow...

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  7. Why are elemental dopants for Silicon or Germanium usually chosen fro...

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  8. Sn, C, Si and Ge are all group XIV elements . Yet , Sn is a conductor ...

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  9. Can the potential barrier across a p-n junction be measured by simply ...

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  10. Draw the output wave form across the resistor

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  11. The amplifiers X, Y and Z are connected in series. If the voltage gain...

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  12. In a CE transistor amplifier, there is a current and voltage gain asso...

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  13. (i) Name the type of a diode whose characteristics are shown in figure...

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  14. Three photodiodes D1 , D2 and D3 are made of semiconductors having ...

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  15. If the resistance R(1) is increased how will the reading of the amme...

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  16. Two car garages have a common gate which needs to open automatically w...

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  17. How would you set up a circuit to obtain NOT gate using a transistor?

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  18. Explain why elemental semiconductor cannot be used to make visible LED...

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  19. Write the truth table for the circuit shown in name the gate that the...

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  20. A Zener of power rating 1 W is to be used as a voltage regulator. If Z...

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