Question

question 6 of 10
which two statements describe reasons a solar cell must contain semiconductors?
a. semiconductors serve as a source of electrons to form an electrical current.
b. current flows from the positively charged semiconductor to the air above the glass covering.
c. semiconductors form a path for the electrons that are released by the photoelectric effect.
d. semiconductors reflect all forms of electromagnetic radiation.

Explanation:

In solar cells, semiconductors are crucial. When light (photons) hits the semiconductor, the photoelectric effect occurs. This effect releases electrons. The semiconductors act as a source of these electrons (as in option A) which are then available to form an electrical current. Also, semiconductors provide a path (as in option C) for these released electrons to flow, enabling the generation of an electric current. Option B is incorrect because current does not flow from the semiconductor to the air above the glass covering in a typical solar - cell operation. Option D is wrong as semiconductors do not reflect all forms of electromagnetic radiation; instead, they interact with certain wavelengths (like visible light for solar cells) to cause the photoelectric effect.

Answer:

A. Semiconductors serve as a source of electrons to form an electrical current.
C. Semiconductors form a path for the electrons that are released by the photoelectric effect.