[amp_mcq option1=”Same number as free electrons” option2=”many” option3=”Only those produced by thermal energy” option4=”less than the free electrons E. None of the above” correct=”option4″]
The correct answer is: D. less than the free electrons.
A hole is a vacancy in a valence band that can be occupied by an electron. In a conductor, there are many free electrons that can move around and conduct electricity. However, there are also many holes that can also conduct electricity. The number of holes is less than the number of free electrons, but they still play an important role in conduction.
Option A is incorrect because there are not the same number of holes as free electrons. Option B is incorrect because there are not many holes. Option C is incorrect because holes are not only produced by thermal energy. Option E is incorrect because the correct answer is D.