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Standard X

Physics

Resistance

Assertion: Th...

Question

Assertion: The electrical conductivity of a semiconductor increases with increase in temperature.
Reason: With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

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

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

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
As temperature increases, some electrons are thermally released from the covalent bonds in pure Si or Ge.
These electrons are free to move in the crystal and are responsible for electrical conductivity.
With an increase in temperature, the number of electrons released increases and the electrical conductivity increases.
This type of conduction is called intrinsic conduction.
Hence, both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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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: Electrical conductivity of semiconductors decreases with increasing temperature.
Reason: With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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.

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Assertion: The electrical conductivity of a semiconductor increases with increase in temperature.Reason: With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

Assertion: The electrical conductivity of a semiconductor increases with increase in temperature.
Reason: With increase in temperature, large number of electrons from the valence band can jump to the conduction band.