The band theory of solids explains satisfactorily the nature of_________________?
Correct answer: D. All of the above
- A. Electrical insulators alone
- B. Electrical conductors alone
- C. Electrical semi conductors alone
- D. All of the above
Explanation
Band theory explains all three classes: conductors have overlapping or partly filled bands, semiconductors have a small forbidden gap, and insulators have a large forbidden gap. Students may choose one of the first three because each is an individual application, but the theory covers all of them.
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About Quantum Theory and Radiation
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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