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Assertion (A): The resistivity of a material depends on the nature and concentration of impurities present in it.
Reason (R): Impurities in a material can introduce energy levels in the forbidden energy gap, leading to increased scattering of electrons, which in turn increases resistivity.
Both A and R are true and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false, but R is true.
Answers (1)
Impurities in a material can act as scattering centres for the electrons, leading to increased resistivity. The nature and concentration of impurities can affect the scattering process and hence the resistivity of the material. This is because impurities can introduce energy levels in the forbidden energy gap, which can act as traps for the electrons, leading to increased scattering.
Therefore, both Assertion (A) and Reason (R) are true. Additionally, Reason (R) provides the correct explanation for Assertion (A). Hence, option (a) is the correct answer.
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