Question

The upper level of valence band and lower level of conduction band overlap in the case of

• A. silicon
• B. copper
• C. carbon
• D. germanium

Answer 1

The Correct Option is B

In a conductor, such as copper, the upper level of the valence band and the lower level of the conduction band overlap, allowing electrons to move freely between these bands. This overlap enables electrical conductivity at room temperature, as electrons can easily jump from the valence band to the conduction band without any energy gap.

In contrast, semiconductors like silicon, carbon, and germanium have a distinct energy gap between the valence band and conduction band.

Thus, the correct answer is (B): copper.