Semiconductors Are More Effective Than Metals as Converters of Solar

question 21

Multiple Choice

Semiconductors are more effective than metals as converters of solar radiation into electricity because

• A)it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid,thereby conducting electricity.
• B)the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid.
• C)metals melt much too easily under direct sunlight and,as liquids,lose their ability to conduct electricity.
• D)solar radiation has sufficient energy to knock electrons completely off the metal surface,making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

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