Скачать или смотреть Semiconductors | Lecture :1 | Energy Band, Intrinsic/Extrinsic, Charge Carriers + PYQs | NEET/JEE

Welcome to ChemClasses with Rahul, where Sourab Dutta Sir explains Kota-level Physics for JEE & NEET aspirants.
This is *Lecture-1 of Semiconductors / Electronics (Class 12 Physics)* — covering classification of materials, band theory, intrinsic and extrinsic semiconductors, charge carriers and temperature dependence of resistivity.


📌 Topics Covered in Lecture-1:
• Classification of Materials — Conductors, Insulators & Semiconductors
• Energy Levels vs Energy Bands
• Valence Band & Conduction Band
• Band Gap (Eg) for Conductors / Semiconductors / Insulators
• Intrinsic Semiconductor
• Extrinsic Semiconductor (P-type & N-type basic idea)
• Charge Carriers — Electrons & Holes
• Temperature effect on conductivity
• Mass Action Law (intro)
• Calculation of maximum wavelength from band energy (Eg to λ)

📍 PYQs Solved in this Lecture:
• NEET 2023 — Smallest resistivity (conductivity trend)
• JEE 2007 — Free electrons in C, Si & Ge
• JEE 2023 — Resistivity vs Temperature curve of semiconductor
• NEET 2022 — Temperature dependence of resistance
• NEET 2012 — Why C is insulator but Si is semiconductor?
• Question — λ for Eg = 0.75 eV (Ge)

🎯 Best For:
✔ NEET 2025 / 2026 / 2027
✔ JEE Main & Advanced
✔ Class 12 Boards — Electronics
✔ Revision + PYQ-based learning

👨‍🏫 Faculty: Sourab Dutta Sir
🎓 Batch: Zero to Topper – JEE/NEET Physics
📺 Channel: ChemClasses with Rahul

📚 Resources:
🔹 Notes + PYQs + Worksheets → Join Telegram https://t.me/Chemclasses_with_Rahul

🌐 Website: www.chemclasseswithrahul.com

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🔥 After this lecture, students will master:
— Energy band model & band gap logic
— Reason for conductivity variation with temperature
— Why Ge/Si behave differently from C
— How to decide electron vs hole conductivity
— Expected PYQ patterns in Semiconductors
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