With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
Correct answer: B. Increases
- A. Decreases
- B. Increases
- C. Remains same
- D. First increases then decreases
Explanation
Heating an intrinsic semiconductor supplies energy across its small band gap, creating more electron-hole pairs and increasing the number of charge carriers, so conductivity increases. Students may choose decreases by applying the metallic rule that resistance rises with temperature, but semiconductors behave oppositely because carrier concentration increases strongly.
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Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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