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  • Assertion (A): Semiconductors are solids with conductivities in the intermediate range from 10^-6 - 10^-4 ohm ^-1m^-1

In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and Reason both are correct statements and Reason is the correct explanation for Assertion.
(b) Assertion and Reason both are correct statements but Reason is not the correct explanation for Assertion.
(c) Assertion is correct but Reason is wrong.
(d) Assertion is wrong but Reason is correct.

Assertion (A): Semiconductors are solids with conductivities in the intermediate range from 10^{-6}-10^{4}ohm^{-1}m^{-1}
 
Reason (R): Intermediate conductivity in semiconductor is due to partially filled valence band.

Answers (1)

The answer is the option (c) Assertion is correct but Reason is wrong.
Conductance of semiconductors lies between metals and insulators, i.e., in the range of 10^{-6}-10^{4}ohm^{-1}m^{-1}

Valence band is either filled or empty in semiconductors, it is the gas which is in between conductors and insulators.

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