JEE Main 2017 Physics question
Not in JEE Advanced syllabus
The conductivity of a semiconductor sample having electron concentration of electrons m, hole concentration of holes m, electron mobility of m V s and hole mobility of m V s is: (Take charge of an electron as C)
Answer: (2)
Solution
Both carrier types contribute to the conductivity of a semiconductor:
σ = μ_e + μ_h).
Evaluate the two terms separately. The electron term is
μ_e = 5××2.0 = 1.0×,
and the hole term, despite the ten-times larger hole concentration, is much smaller because the
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