Intrinsic Semiconductors Challenge
25 NEET-standard questions on the Si and Ge lattice, covalent bonds, electron–hole pairs, hole motion, total current, generation and recombination, and the band picture of an intrinsic semiconductor. Answer each one. If you get it wrong, Vidya Ma’am explains it with an animated movie you can control, a slider to play with, and a step-by-step solution. Then try again.
NCERT Physics XII Part II · Ch. 14 · pp. 327–329Keys: A–D or 1–4 to answer
🧠 Formula memory tricks (open before you start)
LatticeSi, Ge: 4 valence electrons, 4 nearest neighbours, covalent bondseach bond = 2 shared electrons
HoleA vacancy in a bond acts as a free particle of charge +qmoves towards negative potential
Intrinsic carriersne = nh = nievery broken bond makes one pair
Total currentI = Ie + Ihelectrons and holes move opposite ways, currents add
BalanceGeneration and recombination both go on; at equilibrium the rates are equal.equal, not zero
TemperatureAt 0 K: insulator. Higher T: more pairs, more conductivity.
C, Si, GeBonding electrons in 2nd, 3rd, 4th orbit: Eg is highest for C, lowest for Ge.
right first tryfixed after explanationstill to fix
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