Assertion (A): Metals have high thermal conductivity.
Reason (R): Due to thermal excitation of many electrons from the valence band to the conductance band, metals have high thermal conductivity.

Options

A. 1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
B. 2) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. 3) (A) is correct but (R) is wrong.
D. 4) (A) is wrong but (R) is correct.

Answer

A

Explanation

Both (A) and (R) are correct and (R) is the correct explanation of (A).