Recent content by Kit

yes. this is what i think. u can imagine if there are some defected states below the fermi level but above the top of the valence band. electrons can be found there.

distance between moon and Earth (center to center) = 384,403km mass of moon = 7.3477 × 10e22 kg mass of Earth = 5.9736 × 10e24 kg geostationary orbit = 35,888.71 km u can calculate the gravitational field strengths (by Earth or moon) at the geostationary orbit and compares the values.

physically, u cannot find the electrons between the band gap since there is no avaliable states within the bandgap. as u said the "Fermi Level is defined as the maximum energy an electron posesses at 0k". it just said that is the maximum possible energy that the electrons might have.

for black holes, we can find some evidences to prove its existence(ex. gravitational lens...etc) so how about while holes, can we observe anythinjg about white holes?? or it only exists mathmatically?? thanks for answering^^ kit

ok thanks a lot^o^ kit

1. What are the most powerful permanent magnets made of? How strong do they get? Ans: permanent magnet in fact is base on ferromagnetism. i think u can look it up here http://en.wikipedia.org/wiki/Permanent_magnet#Permanent_magnets i dun know what is the strongest magnet in the world. but if u...

thanks u guys~~:smile:

i think u miss the contribution of the fuel of the car too. this is not simply u press the accelerator and the the car would accelerate. there are many other things would be involved. hope it helps^^ kit

i am not good in math but in physics there are many "beautiful" equations and calculations which are so complicated. i am always stuck by them when i am reading:cry: . did u guys have the same situation before? any ways to overcome it?? take some math courses:confused: ? kit

i think i got a better idea but i need more infomation 1. i got the book of kittel but i cannot find the equation Delta E = SJ(M) in the chapter of ferronmagnetism and antiferromagnetism. where can i find more info about this, thanks. 2. i also want more details about the exceptional cases...

thanks a lot ^^ let me look up the references first

for a ferromagnetic metal, the there will be splitting of energy band(one for spin up e- and one for spin down e-) under the influence of external magnetic field. the it is known as exchange splitting. here are my questions 1. what determine the degree of splitting? i guess it depends on the...

i have a clearer picture now thanks for answering:smile:

is the material, which has a larger bandgap, more resistive:confused: ? thanks for answering:smile: kit

i have searched it online but i can't find any material describing this effect. >.< what is it about?:confused: thanks for answering:smile: kit