First slide

Classification of Metals, semiconductors and insulators

Question

Metallic solids are always opaque because

Easy

A

Solids effect the incident light
B

Incident light is readily absorbed by the free electrons in a metal
C

Incident light is scattered by solid molecules
D

Energy band traps the incident light

Solution

Metallic solids are opaque because incident light is absorbed by the free electrons in a metal.

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