Which of the following shows correct range of conductivity ?
(i)Conductors : `10^4` to `10^7 ohm^(-1) m^(-1)`
(ii)insulators : `10^(-6)` to `10^4 ohm^(-1) m^(-1)`
(iii)Semiconductors : `10^(-10)` to `10^(-6) ohm^(-1) m^(-1)`

Options

A. (i) and (ii)
B. (i) only
C. (ii) and (iii)
D. (i) , (ii) and (iii)

Answer

B

Explanation

Conductors `10^(4) "to" 10^(7) "ohm"^(-1)m^(-1)`
Insulators : `10^(-20) "to" 10^(-10) "ohm"^(-1)m^(-1)`
Semiconductors : `10^(-6) "to" 10^(4) "ohm"^(-1)m^(-1)`