The correct sequence of conductivity of the following materials at 300 K in the increasing order is
(A) Copper
(B) Graphite
(C) Germanium
(D) Silicon
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (D), (C), (B), (A)
Electrical conductivity at 300 K (room temperature) for the given materials:
- Silicon (Si) → semiconductor, low conductivity
- Germanium (Ge) → semiconductor, higher conductivity than Si
- Graphite → good conductor (delocalized π electrons)
- Copper (Cu) → excellent conductor, highest conductivity
Increasing order of conductivity:
$\text{Si (D)} < \text{Ge (C)} < \text{Graphite (B)} < \text{Cu (A)}$