Carbon, silicon, and germanium have four vale | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Carbon $(C)$, Silicon $(Si)$, and Germanium $(Ge)$ all belong to Group $14$ of the periodic table and have $4$ valence electrons.At room temperatu

Vedclass · Accepted Answer

The number of free electrons for conduction is significant only in $Si$ and $Ge$ but small in $C$.

Vedclass · Answer

(D) Carbon $(C)$, Silicon $(Si)$, and Germanium $(Ge)$ all belong to Group $14$ of the periodic table and have $4$ valence electrons.At room temperature, the energy band gap $(E_g)$ for Carbon (diamond) is approximately $5.4 	ext{ eV}$, which is very large, making it an insulator.For Silicon, $E_g \approx 1.1 	ext{ eV}$, and for Germanium, $E_g \approx 0.7 	ext{ eV}$.Because these band gaps are relatively small, thermal energy at room temperature is sufficient to excite a significant number of electrons from the valence band to the conduction band in $Si$ and $Ge$, making them semiconductors.In contrast, the large band gap of Carbon prevents significant electron excitation at room temperature, resulting in a negligible number of free conduction electrons.Therefore, the number of free conduction electrons is significant in $Si$ and $Ge$ but small in $C$.

Carbon, silicon, and germanium have four valence electrons each. At room temperature, which one of the following statements is most appropriate?

Similar Questions

Carbon,Silicon,and Germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gaps respectively equal to $(E_g)_C, (E_g)_{Si},$ and $(E_g)_{Ge}$. Which of the following statements is true?

GaAs is

The forbidden energy gap in $Ge$ is $0.72\,eV$. Given,$hc = 12400\,eV\cdot\mathring{A}$. The maximum wavelength of radiation that will generate an electron-hole pair is..........$\mathring{A}$.

Write the definition of valence band and conduction band.

The forbidden energy gap for a germanium crystal is approximately ....... $J$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module