Question
A semiconductor is doped with a donor impurity:
✓
Answer
- The electron concentration increases.
When a semiconductor is doped with a donor type such as arsenic or phosphorous, which has five valence electrons, the donor atom replaces the Si or Ge atom. As a result, four out of the five electrons of the donor atom form a covalent bond by sharing an electron with four atoms of silicon. However, the fifth electron is free to move. Also, due to the breaking up of covalent bonds at room temperature, equal number of electrons and holes are produced. Thus, the total number of holes in the n-type semiconductor is less compared to the number of free electrons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
More "M.C.Q (1 Marks)" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→
Similar questions
A torch battery consisting of two cells of 1.45 volts and an internal resistance 0.15Ω, each cell sending currents through the filament of the lamps having resistance 1.5ohms. The value of current will be(a) 16.11 amp(b) 1.611 amp(c) 0.1611 amp(d) 2.6 amp
In which of the following cases the centre of mass of a rod is certainly not at its centre?
- The density continuously increases from left to right.
- The density continuously decreases from left to right.
- The density decreases from left to right upto the centre and then increases.
- The density increases from left to right upto the centre and then decreases.
Rutherford’s a-particle experiment showed that the atoms have:
An electric bulb marked $40 W - 200 V$ is used in a circuit of supply voltage $100 V.$ Now its power is:
→What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength $6000 \mathring A$ is used and slit width is $12 \times 10^{-5}\ cm$
→For nuclei with A > 100:
Figure represents two simple harmonic motions. The parameter which has different values in the two motions is:
- Amplitude.
- Frequency.
- Phase.
- Maximum velocity.
A semiconductor is doped with a donor impurity:
- The hole concentration increases.
- The hole concentration decreases.
- The electron concentration increases.
- The electron concentration decreases.
The velocity of light emitted by a source $S$ observed by an observer $O,$ who is at rest with respect to $S$ is $c.$ If the observer moves towards $S$ with velocity $v,$ the velocity of light as observed will be
→In the diagram shown if a bar magnet is moved along the common axis of two single turn coils A and B in the direction of arrow then-
