An n-type semiconductor specimen has a Hall coefficient of 300cm³/C and its resistivity is 0.1 Ω-cm. Its electron mobility is

Hall effect:

The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current.

The Hall effect is used to determine carrier type, concentration, and mobility as a function of temperature.

Hall coefficient:

The Hall coefficient (RH) is defined as the ratio of the induced electric field to the product of the current density and the applied magnetic field.  

\({R_H} = \frac{\sigma }{{pe}}\) , where σ = conductivity

pe =concentration of charges.

Mobility of charges is given by \({\mu _p} = \frac{{{\sigma _p}}}{{P.e}} = {\sigma _p}.{R_H} = \frac{{{R_H}}}{\rho }\;\) 

Calculation:

The hall coefficient RH = 300 cm3/C

Resistivity (ρ) = 0.1 Ω -cm