number density

here we use the equation

n_en_h=n_i²

here ne is the number  density of electrons in the sample and nh is the number density of the holes in the  sample.

and ni is the number density of the  intrinsic atoms  in the sample.

putting all the values in the  equation we get.

number density of the electron shall approximately will be  3.310¹¹per meter cube.