Semiconductors Are More Effective Than Metals as Converters of Solar

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.