The conductivity of materials found in nature ranges from 10⁹ ohm¯¹m¯¹ to nearly 10¹⁸ ohm¯¹ m¯¹ from this it can be concluded that the conductivity of silicon in ohm¯¹ cm¯¹ will be nearly

• A. 0.5 x 10¯¹⁵
• B. 0.5 x 10¯²¹
• C. 0.5 x 10¯¹²
• D. 0.5 x 10¯³