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A semiconductor has an electron concentr...

A semiconductor has an electron concentration of `8xx10^(13)` per `cm^(3)` and a hole concentration of `5xx10^(12)` per `cm^(3)`. The electron mobilityis `25,000 cm^(2)V^(-1)sec^(-1)` and the hole mobility is `100cm^(2)V^(-1)sec^(-1)` and the hole mobility is `100cm^(2)V^(-1)sec^(-1)`
(i) The semiconductor is `n`-type
(ii) the semiconductor is `p`-type
(iii) the conductivity is `320m mho cm^(-1)`
(iv) the conductivity is `80m mho cm^(-1)`

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