One of the following is a photoconductor :
Correct answer: C. Selenium
- A. Silver
- B. Gold
- C. Selenium
- D. Mercury
Explanation
Photoconductivity is an optical and electrical phenomenon in which a material becomes more electrically conductive due to the absorption of electromagnetic radiation such as visible light, ultraviolet light, infrared light, or gamma radiation. The photoconductivity of grey selenium arises from the ability of incident light to excite electron across its reasonably small band gap (2.6 eV in the crystalline form, 1.8 eV in the amorphous form).
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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