Question
How does electric conduction take place inside a pure silicon?
✓
Answer
- There are two different types of charge carriers in a pure semiconductor. One is the electron and the other is the hole or absence of electron.
- Electrical conduction takes place by transportation of both carriers or any one of the two carriers in a semiconductor.
- When a semiconductor is connected in a circuit, electrons, being negatively charged, move towards positive terminal of the battery.
- Holes have an effective positive charge, and move towards negative terminal of the battery. Thus, the current through a semiconductor is carried by two types of charge carriers moving in opposite directions.
- Figure given below represents the current through a pure silicon.
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
Similar questions
With the help of neat diagram, explain the structure of $p-$type semiconductor in detail.
→Define couple. Show that moment of couple is independent of the points of application of forces.
Represent graphically the variation of total energy, kinetic energy and potential energy of a satellite with its distance from the centre of the Earth.
A child walking on a footpath notices that the width of the footpath is uneven. He reported this to his school principal and the complaint was forwarded to the municipal officer.
i. What is the possible error encountered?
ii. What is the relative error in width of footpath if width of footpath in $10 m$ length are noted as $5 m, 5.5 m, 5 m, 6 m$ and $4.5 m?$
→i. What is the possible error encountered?
ii. What is the relative error in width of footpath if width of footpath in $10 m$ length are noted as $5 m, 5.5 m, 5 m, 6 m$ and $4.5 m?$
A metal sphere cools at the rate of $0.05^{\circ} C / s$ when its temperature is $70^{\circ} C$ and at the rate of $0.025^{\circ} C / s$ when its temperature is $50^{\circ} C$. Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is $40^{\circ} C$.
→Distinguish between intrinsic semiconductors and extrinsic semiconductors
Why are prism binoculars preferred over traditional binoculars? Describe its working in brief.
The position-time (x – t) graphs for two children A and B returning from their school O to their homes P and Q respectively are shown in figure. Choose the correct entries in the brackets below.
i) (A/B) lives closer to the school than (B/A)
ii) (A/B) starts from the school earlier than (B/A)
iii) (A/B) walks faster than (B/A)
iv) A and B reach home at the (same/different) time
v) (A/B) overtakes (B/A) on the road (once/twice)
i) (A/B) lives closer to the school than (B/A)
ii) (A/B) starts from the school earlier than (B/A)
iii) (A/B) walks faster than (B/A)
iv) A and B reach home at the (same/different) time
v) (A/B) overtakes (B/A) on the road (once/twice)
Three charges of $2 \mu C, 3\mu C$ and $4 \mu C$ are placed at points $A, B$ and $C$ respectively, as shown in the figure. Determine the force on $A$ due to other charges.
$($Given: $AB = 4 \ cm, BC = 3 \ cm)$
→$($Given: $AB = 4 \ cm, BC = 3 \ cm)$
Three thin walled uniform hollow spheres of radii $1 \ cm, 2 \ cm$ and $3 \ cm$ are so located that their centres are on the three vertices of an equilateral triangle$\text{ABC}$ having each side $10 \ cm.$ Determine centre of mass of the system
→