Which one has the greatest energy gap ?
Correct answer: D. Non metals
- A. Semi conductor
- B. Conductor
- C. Metals
- D. Non metals
Explanation
Non-metals that are electrical insulators generally have the largest forbidden energy gaps, while metals have overlapping or zero effective gaps and semiconductors have small gaps. The likely alternative is semiconductor, but its defining feature is a narrow gap, not the greatest one.
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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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