In a semiconducting material the mobilities of electrons and holes are `mu_(e)` and `mu_(h)` respectively. Which of the following is true?A. `mu_(e) lt mu_(h)`B. `mu_(e) gt mu_(h)`C. `mu_(e)=mu_(h)`D. `mu_(e) lt 0 , mu_(h) gt 0`

In a semiconducting material the mobilities of electrons and holes are

1.	In a semiconducting material the mobilities of electrons and holes are `mu_(e)` and `mu_(h)` respectively. Which of the following is true?A. `mu_(e) lt mu_(h)`B. `mu_(e) gt mu_(h)`C. `mu_(e)=mu_(h)`D. `mu_(e) lt 0 , mu_(h) gt 0`
Answer» Correct Answer - B In a semiconductor, hole is equivalent to positively charged particle which moves in a direction opposite to that of an electron. Since electrons are lighter in mass compared to positively charged particles they move easily in the semiconducting material. Hence, the mobility of holes in `p`-type semiconductor is less than mobility of electrons in `n`-type semiconductor. i.e. `n_(e)gtn_(h)`

Discussion

No Comment Found

Related InterviewSolutions

The depletion layer in diode is `1 mum` wide and the knee potential is `0.6 V`, then the electric field in the depletion layer will beA. zeroB. `0.6 Vm^(-1)`C. `6xx10^(4) V//m`D. `6xx10^(5)V//m`
The diagram shows an operational circuit. Which of the following correctely states the nature and magnitude of the amplification ? A. `{:("Nature","Magnitude of"(V_(0))/(V_(i))),("Inverting"," 0.2"):}`B. `{:("Nature","Magnitude of"(V_(0))/(V_(i))),("Inverting"," 5.0"):}`C. `{:("Nature","Magnitude of"(V_(0))/(V_(i))),("Non-inverting"," 0.2"):}`D. `{:("Nature","Magnitude of"(V_(0))/(V_(i))),("Non-inverting"," 5.0"):}`
The following truth table corresponds to the logic gate `|(A,0,0,1,1),(B,0,1,0,1),(X,0,1,1,1)|`A. `NAND`B. `OR`C. `AND`D. `XOR`
Which of the following gates corresponds to the truth table given below ? `|(A,B,X),(1,1,0),(1,0,1),(0,1,1),(0,0,1)|`A. `XOR`B. `OR`C. `NAND`D. `NOR`
The following truth table belongs to which one of the following four gates? `|(A,B,C),(1,1,0),(1,0,0),(0,1,0),(0,0,1)|`A. `OR`B. `NAND`C. `XOR`D. `NOR`
Pure sodium `(Na)` is a good conductor of electricity because the `3s` and `3p` atomic bands overlap to from a partially filled conduction band. By contrast the ionic sodium chloride `(NaCl)` crystal isA. InsulatorB. ConductorC. SemiconductorD. None of these
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order ofA. `1 MeV`B. `0.1 MeV`C. `1 eV`D. `5 eV`
In a good conductor the energy gap between the conduction band and the valence band isA. InfiniteB. WideC. NarrowD. Zero
In a common emitter amplifier , when a signal of 40 mV is added to the input voltage, the base current changes by `100 muA` and emitter current changes by 2.1mA the trans-conductance isA. `1/20 Omega^(-1)`B. `1/50 Omega^(-1)`C. `50 Omega^(-1)`D. `15 Omega^(-1)`
In the given circuit, calculate the ratio of currents through the battery if (1) Key `K_(1)` is pressed, `K_(2)` open and then (2) Key `K_(2)` is pressed, key `K_(1)` is opened A. `1/2`B. 4C. 2D. 1

In a semiconducting material the mobilities of electrons and holes are `mu_(e)` and `mu_(h)` respectively. Which of the following is true?A. `mu_(e) lt mu_(h)`B. `mu_(e) gt mu_(h)`C. `mu_(e)=mu_(h)`D. `mu_(e) lt 0 , mu_(h) gt 0`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment