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Assertion :-(A) semiconductors are so...

Assertion :-(A) semiconductors are solids with conductivites in the intermediate range from`10^(-6)-10^(4) ohm ^(-1)m^(-1)`
Reason :-(R ) internmediate conductivity in semiconductor Is due to partially filled valence band .

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Assertion : Semiconductors are the solids with conductivities in the intermediate range from 10^(-6) to 10^(4) "ohm"^(-1)m^(-1) . Reason : In case of semiconductors, the gap between the valence band and conduction band is small.

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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.