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Concept drill

mobility

GATE Electronics & Communication · Semiconductor Physics - Intrinsic Semiconductors · 1994-2026

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2026 Q64

Consider that the concentration of electrons in a semiconductor bar varies linearly from 2 × 10^17 cm^−3 at x = 1 µm to 1× 10^16 cm^−3 at x = 4 µm along the x-direction. Assume tha...

mediumanswer key
2025 Q46

The intrinsic carrier concentration of a semiconductor is 2.5 x 10^16 /m³ at 300 K. If the electron and hole mobilities are 0.15 m²/Vs and 0.05 m²/Vs, respectively, then the intrin...

mediumanswer key
2025 PYQ

The electron mobility $\mu_n$ in a non-degenerate germanium semiconductor at 300 K is $0.38 \mathrm{~m}^2 / \mathrm{Vs}$. The electron diffusivity $D_n$ at 300 K (in $\mathrm{cm}^2...

easyanswer keybasic explanation
2025 PYQ

The intrinsic carrier concentration of a semiconductor is $2.5 \times 10^{16} / \mathrm{m}^3$ at 300 K . If the electron and hole mobilities are $0.15 \mathrm{~m}^2 / \mathrm{Vs}$...

easyanswer keybasic explanation
2019 Q50

Consider a long-channel MOSFET with a channel length 1 µm and width 10 µm. The device parameters are acceptor concentration N_A= 5 × 10¹⁶ cm⁻³, electron mobility µ_n=800 cm²/V-s, o...

medium
2015 PYQ

A silicon sample is uniformly doped with donor type impurities with a concentration of $$10^{16}/cm^3$$.The electron and hole mobilities in the sample are $$1200\;cm^2/V-s$$ and $$...

easy
2014 PYQ

At T = 300 K, the hole mobility of a semiconductor $$\mu_p\;=500\;cm^2/V-s$$ and $$\frac{kT}q\;=\;26\;mV$$.The hole diffusion constant D p in cm 2 /s is__________.

easy
2005 PYQ

A silicon sample 'A' is doped with 10 18 atoms/cm 3 of Boron. Another sample 'B' of identical dimensions is doped with 10 18 atoms/cm 3 of Phosphorus. The ratio of electron to hole...

easyanswer key
2003 PYQ

An n-type silicon bar 0.1 cm long and $$100\;\mu m^2$$ in cross-sectional area has a majority carrier concentration of $$5\times10^{20}/m^3$$ and the carrier mobility is $$0.13\;\;...

easyanswer key
1994 PYQ

A p-type silicon sample has a higher conductivity compared to an n-type sample having the same dopant concentration.

easyanswer key
1994 PYQ

A small concentration of minority carries is injected into a homogeneous semiconductor crystal at one point. An electric field of 10 V/cm is applied across the crystal and this mov...

easyanswer key