If the ratio of the concentration of electron to that of holes in a semiconductor is `(7)/(5)` and the ratio of currect is `(7)/(4)` then what is the ratio of their drift velocities ?

If the ratio of the concentration of electron to that of holes in a semiconductor is (7)/(5) and the ratio of current is (7)/(4) then what is the ratio of their drift velocities ?

Ratio of number density of holes is (7)/(5) and ratio of their current is (7)/(4) in a semiconductor. The ratio of their drift velocity is …….

The ratio of number density of free electron and hole in p-type semiconductor is …….

The ratio of electron and hole current in a semiconductor is (7)/(5) and the ratio of drift velocities electrons and holes is (1)/(4) ,then the ratio of concentrations of electrons and holes will be ?

If the mass ratio of O_2 and is 4:7 , then the ratio of their moles is