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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2021, Shift 2, Physics Q29

Question 29 of 90 in this shift, Physics question 29 of 30, Section B.

In a semiconductor, the number density of intrinsic charge carriers at 27°C is 1.5×10161.5\times10^{16}/m3^3. If the semiconductor is doped with impurity atom, the hole density increases to 4.5×10224.5\times10^{22}/m3^3. The electron density in the doped semiconductor is __________ ×109\times10^{9}/m3^3.

Official answer

5

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.