Which of the following is NOT an electromagnetic wave?
Correct answer: D. Large energy gapped between electrons
- A. Complete valence band
- B. Partially filled conduction band
- C. Tightly bounded valence electrons
- D. Large energy gapped between electrons
Explanation
Electromagnetic waves are characterized by the oscillation of electric and magnetic fields propagating through space, such as visible light, radio waves, microwaves, and X-rays. Options A, B, and C do not describe the characteristics of electromagnetic waves, while Option D correctly identifies that electromagnetic waves do not have a large energy gap between electrons.
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Electrical properties of solids depend on their band structure, charge carriers and conductivity. The topic compares conductors, insulators and semiconductors, relates resistivity to temperature, and covers intrinsic and extrinsic semiconductors, donor and acceptor impurities, electron and hole conduction, and the formation of p-type and n-type materials.
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