We have valence electrons and conduction electrons in a semicondu… - Vidyadip

Question

We have valence electrons and conduction electrons in a semiconductor. Do we also have 'valence holes' and 'conduction holes'?

✓

Answer

Holes do not exist in reality. They exist only virtually. When an electron jumps from the valence band to the conduction band, a vacancy is created at the place from where the electron had jumped. This vacancy is called a hole. So, a valence or conduction hole is a virtual concept only.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Semiconductors and Semiconductor Devices→Semiconductors and Semiconductor Devices — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

The lower end of a capillary tube of diameter $2.00 mm$ is dipped 8.00 $cm$ below the surface of water in a beaker. What is the pressure required in the tube in order to blow a hemispherical bubble at Its end in water? The surface tension of water at temperature of the experiments is $7.30 \times 10^{-2} Nm ^{-1} .1$ atmospheric pressure $=$ $1.01 \times 10^5 Pa$, density of water $=1000 kg / m ^3$. $g =9.80 m s ^2$. Also calculate the excess pressure.

Two wires of different densities but same area of crosssection are soldered together at one end and are stretched to a tension T. The velocity of a transverse wave in the first wire is double of that in the second wire. Find the ratio of the density of the first wire to that of the second wire.

The condition of air in a cloeed room is described as follows. Temperature = 25°C, relative humidity = 60%, pressure = 104kPa. lf all the water vapour is removed from the room without changing the temperature, what will be the new pressure? The saturation vapour pressure at 25°C = 3.2kPa.

An average emf of 20V is induced in an inductor when the current in it is changed from 2.5A in one direction to the same value in the opposite direction in 0.1s. Find the self-inductance of the inductor.

A body of mass 1.0kg is suspended from a weightless spring having force constant 600Nm^-1. Another body of mass 0.5kg moving vertically upwards hits the suspended body with a velocity of 3.0ms^-1 and gets embedded in it. Find the frequency of oscillations and amplitude of motion.

Using $\text{B}=\mu_0\text{H},$ find the ratio $\frac{\text{E}_0}{\text{H}_0}$ for a plane electromagnetic wave propagating through vacuum. Show that it has the dimensions of electric resistance. This ratio is a universal constant called the impedance of free space.

Give example of a situation in which an applied force does not result in a change in kinetic energy.

If the acceleration due to gravity on moon is one sixth that on the earth what will be the length and time period of a second's pendulum there? (g = 9.8 ms?)

The length of a rod is exactly 1m when measured at rest. What will be its length when it moves at a speed of:

3 × 10⁵m/s.
3 × 10⁶m/s.
3 × 10⁷m/s.

Calculate the total number of degrees of freedom possessed by the molecules in one cm³ of H₂ gas at NTP.