Menu

Tag: physics

12. Class 12th Physics |Semiconductor & its Types | Generation & Recombination of e-h Pairs

9 Comments
12. Class 12th Physics |Semiconductor & its Types | Generation & Recombination of e-h Pairs

let us discuss an important phenomena in semiconductors that is generation and recombination of electron hole pairs, as we have already discussed that , in a pure semiconductor , concentration of electrons is equal to concentration of holes. and we can write that , due to . thermal agitation. continuously , new electron hole pairs […]

Physics – What is the Archimedes’ Principle?

100 Comments
Physics – What is the Archimedes’ Principle?

Say you have a beaker filled with water and you put your index finger inside it. You’ll observe that the water level rises slightly. You put in two fingers, the water level rises a bit more. And now when you put in your hand up to the wrist level, you’ll see that the water level […]

What is Physics?

100 Comments
What is Physics?

What makes physics so cool? To me, physics is awesome and interesting because it asks the one question no other [physical] science does: “how?” Physics looks at how things happen-the reason things happen-and explains it. No other [physical] science does this. Chemistry deals with the result of things happening while biology deals with why things […]

How to Build a Teleporter with Aliens

100 Comments
How to Build a Teleporter with Aliens

Suppose we’re working with aliens who live near Alpha Centauri to build a wormhole teleporter so we can go visit them – for dinner, or interstellar diplomacy, or whatever. Of course we’ll need to be able to talk with them about what to make each side of the portal out of, how big to make […]

10. Class 12th Physics | Semiconductor & its Types | Types of Semiconductors | by Ashish Arora

3 Comments
10. Class 12th Physics | Semiconductor & its Types | Types of Semiconductors | by Ashish Arora

let us study the types of semiconductors , semiconductors are categorized in two major categories on the basis of conductivity , we can write that , as discussed , conductivity , of semiconductors increases with, rise in temperature .we can also say that , this is an important point we must note it that , […]

7. Class 12th Physics | Semiconductor & its Types | Band Structure in Metals | by Ashish Arora

7 Comments
7. Class 12th Physics | Semiconductor & its Types | Band Structure in Metals | by Ashish Arora

let us discuss about band structure in metals . as , we have already studied about conduction band . in earlier section , i just write it again. that conduction band is , the overlapped region , of common orbitals, of atoms, in a lattice structure , we know that all those electrons which exist […]

9. Class 12th Physics | Semiconductor & its Types | Band Structure in Semiconductors | Ashish Arora

11 Comments
9. Class 12th Physics | Semiconductor & its Types | Band Structure in Semiconductors | Ashish Arora

let us study the band structure in semi conductors , we can write that , band structure. in semiconductors are, similar to insulators, which. we have already studied ,in previous sections, that in insulators conduction band exist high above . the fermi level in valence band, but here we can say band structure in semiconductors […]

Maxwell’s Equations: Crash Course Physics #37

99 Comments
Maxwell’s Equations: Crash Course Physics #37

By the 19th century, we were pretty sure there was something was going on between electricity and magnetism. First, in the early 1800s, Michael Faraday showed us how a changing magnetic field induces an electromotive force, or emf, resulting in an electric current. He also found that electric fields sometimes act like magnetic fields, and […]

22. Metals, Insulators, and Semiconductors

23 Comments
22. Metals, Insulators, and Semiconductors

The following content is provided under a Creative Commons license. Your support will help MIT OpenCourseWare continue to offer high quality educational resources for free. To make a donation or view additional materials from hundreds of MIT courses, visit MIT OpenCourseWare at ocw.mit.edu. PROFESSOR: Hi everyone. Spring has regressed. So, we have– we’re going to […]

Vectors and 2D Motion: Crash Course Physics #4

100 Comments
Vectors and 2D Motion: Crash Course Physics #4

So far, we’ve spent a lot of time predicting movement: where things are, where they’re going, and how quickly they’re gonna get there. But there’s something missing — something that has a lot to do with Harry Styles. And today, we’re gonna address that. We’ve been talking about what happens when you do things like […]