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Standard XII

Physics

Energy Band Diagrams

Assertion :Se...

Question

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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Semi-conductors lie between conductors and insulators due to a presence of valence bond electrons.
The intermediate conductivity of a semiconductor is due to the small energy gap between filled valence band and the empty conduction band.

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Similar questions

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 an Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) Semiconductors are solids with conductivities in the intermediate range from $10^{-} 6 - 10^{4} o h m^{-} 1 m^{-} 1$ .

Reason (R) Intermediate conductivity in semiconductor is due to partially filled valence band.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Q. Assertion :Semiconductors are the solids with conductive in the intermediate rage from

10^{- 6}

10^{4}

o h m^{- 1} m^{- 1}

. Reason: In case of semiconductors, the gap between the valence band and conduction band is small.

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Assertion :Semiconductors are solids with conductivities in the intermediate range from 10−6−104 ohm−1m−1. Reason: Intermediate conductivity in semiconductor is due to partially filled valence band.

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