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  • The contribution in the total current flowing through a semiconductor due to electrons and holes are <img alt="\frac{3}{4}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cfrac%

The contribution in the total current flowing through a semiconductor due to electrons and holes
are \frac{3}{4} and \frac{1}{4} respectively. If the drift velocity of electrons is \frac{5}{2}  times that of holes at this temperature, then the ratio of concentration of electrons and holes is

Option: 1

6:5


Option: 2

5:6


Option: 3

3:2


Option: 4

2:3


Answers (1)

best_answer

As we know current density J = nqv

\mathrm{\begin{aligned} & \Rightarrow J_e=n_e q v_e \text { and } J_n=n_n q v_n \\ & \Rightarrow \frac{J_e}{J_n}=\frac{n_e}{n_e} \times \frac{v_e}{V_n} \\ & \Rightarrow \frac{3 / 4}{1 / 4}=\frac{n_e}{n_n} \times \frac{5}{20} \Rightarrow \frac{n_e}{n_n}=\frac{6}{5} \end{aligned}}

Posted by

vishal kumar

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