A vacant or partially filled band is called _____________________?
Correct answer: A. Conduction band
- A. Conduction band
- B. Valence band
- C. Forbidden band
- D. Empty band
Explanation
A conduction band is an allowed energy band that is empty or only partly occupied, allowing electrons to move into nearby empty energy states. Students may choose the valence band, but that band is normally filled with bonding electrons and does not freely conduct in an insulator.
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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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