Home
Class 12
PHYSICS
The number densities of electrons and ho...

The number densities of electrons and holes in an extrinsic semiconductor are `8 xx 10^13 cm^-3` and `5 xx 10^12cm^-3` respectively and their respective mobilities are : `23 xx 10^3cm^2//Vs` and `10^2cm^2//Vs`. The conductivity of the semiconductor is

A

`2 S cm^-1`

B

`1 S cm^-1`

C

`0.5 S cm^-1`

D

`0.25 S cm^-1`.

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

The number densities of electrons and holes in pure silicon are 1.5 xx 10^16m^-3 . On doping with indium, the hole density becomes 4.5 xx 10^22 m^-3 , the electron density is

A semiconductor is known to have an electron concentration of 8 xx 10^13 cm^-3 and hole concentration of 5 xx 10^12 cm^-3 . The semiconductor is

The intrinsic number density of charge carriers in a semiconductor is 2.5 xx 10^13 cm^-3 . It is doped with donor atoms of number density 1.25 xx 10^17cm^-3 , the ratio of conductivities of doped and intrinsic semiconductors is

Find the area of a ring whose outer and inner radii are 12 cm and 10cm respectively.

The solubility products of AgCl and Ag_2CrO_4 are 1.5 xx 10^(-10) and 9 xx 10^(-12) respectively. Which of the following statement is correct ?

The dissociation constants of acids HA,HB,HC,HD are 2.6 xx10^(-3),5.3 xx10^(-6),1.1 xx 10^(-2)and 7.5 xx 10^(_5) respectively. The weakest acid among these acids is

If the solubility product of AgBrO_3 and Ag_2 SO_4 are 5.5 xx 10^(-5) and 2 xx 10^(-5) respectively, the relationship between the solubilities of these have correctly represented as

Radii of twi concentre circles 8 cm a and 10 cm respectively.The length of the greatest chord which is tangent to the inner circle is:

Add 4.00 xx 10^(-2) , 3.26 xx 10^(-3) and 1 xx 10^(-6) to the correct number of significant digits :