Recent content by Karthikeyan

Hi all, When we add 'B' impurities to 'Si', we get some discrete energy levels above the valence band (Energy level of holes!). I believe that the electrons from Si and B which are participating in the bond formation have different energy levels {Different orbits}. :confused: Correct me if...

Hi all, What causes the electrons to jump into holes?? Thanks, Karthikeyan.K

What about the number of states in the conduction band? Is this finite?? Is it like we can never fill all the energy states in the conduction band??

Hi all, From Pauli's principles, electrons cannot move into an already filled state. If i assume that somehow I fill in all the energy states in the conduction band (Population inversion :confused: )and then apply an electric field what happens?? Thanks...

Thanks...In most of the Semiconductor Physics Textbooks, they say that the probability of finding an electron at Fermi Energy ( Chemical Potential, as you say ) is 0.5. What does this mean?? and why should the probability curve is symmetric about the fermi level (i.e 0.5 probability) above zero...

Hi all, We say the energy difference between the Top of Valence band and the bottom of Conduction band as the forbidden gap or Band gap. But when we see the fermi level at zero Kelvin, its exactly at the middle of the band gap. Does this mean that there is possibility for an electron to...

I mean how does the energy get transmitted from electric field?? Free electrons are already present in metals wandering here and there, right?? By applying some field the direction of motion is oriented. I am asking how this force orients the electrons?? Also, does free electrons lose any energy...

Conduction of electrons Hi all, Can anyone please give a brief explanation on movement of electrons in conductors?? How the force is transmitted from the voltage source..interms of what?? Photons?

Let me say, I've a free electron 'X' at energy level E1 wandering inside the conductor. When u say the energy is transferred, do u mean the electron 'X' will come down to a lower energy than E1??

Hi, I believe that the free electrons in a piece of a conductor move randomnly until they are oriented in one particular direction by some external field. Does free electrons lose energy in this random motion??:confused:

Thanks for the replies...I asked this question becoz I had few basic doubts now that with these replies let me formulate them too 1. Fine that light can travel without a medium but how does it happen...In a medium I can say that the energy propagates itself through the medium but how is it...

Hi friends, I have some question regarding particle and wave nature of EM energy. 1. What is a wave and a particle? How are they related? 2. Also, we know that sun light travels through the universe down to earth..so light can travel without any medium...But waves do require medium to...

Also, when we speak about the length contraction, i believe it is the length of something which is moving measured from a stationary reference. Say, I place a 1 m rod ( measured with stationary reference frame) in a spaceship and the spaceship is set off. Now, if i measure the length of the rod...

Hi all, When we r speaking about the unstable particles, I believe we r speaking with our frame of reference. What do we mean when we say that "moving clock runs slower" ? Say two persons ve their clock perfectly synchronised. One of them travels in a spaceship (with his clock) with a speed...

Do u mean to say that particle A , B having same mean life time with respect their own reference frame, but moving with different velocities will disintegrate at different times with respect to some other stationary frame of reference ??