SATHEE: Electronic Devices Question 236

Electronic Devices Question 236

Question: In semiconductor the concentrations of electrons and holes are $8 \times 10^{18} / m 3$ and $5 \times 10^{18} / m$ respectively. If the mobilities of electrons and hole are 2.3 m2/volt-sec and 0.01 m2/volt-sec respectively, then semiconductor is

Options:

A) N-type and its resistivity is 0.34 ohm-metre

B) P-type and its resistivity is 0.034 ohm-metre

C) N-type and its resistivity is 0.034 ohm-metre

D) P-type and its resistivity is 3.40 ohm-metre

Show Answer

Answer:

Correct Answer: A

Solution:

$n_{e} = 8 \times 10^{18} / m^{3}, n_{h} = 5 \times 10^{18} / m^{3}$

$μ_{e} = 2.3 \frac{m^{2}}{v o l t - \sec}, μ_{h} = 0.01 \frac{m^{2}}{v o l t - \sec}$

$∵ n_{e} > n_{h}$ so semiconductor is N-type

Also conductivity $σ = \frac{1}{Resistivity (ρ)} = e (n_{e} μ_{e} + n_{h} μ_{h})$

Therefore $\frac{1}{ρ} = 1.6 \times 10^{- 19} [8 \times 10^{18} \times 2.3 + 5 \times 10^{18} \times 0.01]$

Therefore r = 0.34 W-m.

Electronic Devices Question 236

Question: In semiconductor the concentrations of electrons and holes are $8 \times 10^{18} / m 3$ and $5 \times 10^{18} / m$ respectively. If the mobilities of electrons and hole are 2.3 m2/volt-sec and 0.01 m2/volt-sec respectively, then semiconductor is

Options:

Answer:

Solution:

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Electronic Devices Question 236

Question: In semiconductor the concentrations of electrons and holes are 8×1018/m3 and 5×1018/mrespectively. If the mobilities of electrons and hole are 2.3 m2/volt-sec and 0.01 m2/volt-sec respectively, then semiconductor is

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: In semiconductor the concentrations of electrons and holes are $8 \times 10^{18} / m 3$ and $5 \times 10^{18} / m$ respectively. If the mobilities of electrons and hole are 2.3 m2/volt-sec and 0.01 m2/volt-sec respectively, then semiconductor is