NEET Physics: Questions 1689 - 1694 of 2098
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Question number: 1689
The logic gate NOT cannot be built by using diode.
The output voltage and the input voltage of the diode have 180° phase difference.
|Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|| |
|Ꭺ is false but Ꭱ is true|| |
|Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|| |
|Ꭺ is true but Ꭱ is false|| |
Question number: 1690
Doping changes the Fermi energy of a semiconductor. Consider silicon, with a gap of 1.11 eV between the top of the valence bond and the bottom of the conduction band. At 300K the Fermi level of the pure material is nearly at the mid-point of the gap. Suppose that silicon is doped with donor atoms, each of which has a state 0.15 eV below the bottom of the silicon conduction band, and suppose further that doping raises the Fermi level to 0.11 eV below the bottom of that band.