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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%7B3%7D%7B4%7

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 radio 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 \mathrm{J=n q v}

\mathrm{ \Rightarrow \quad j_e=n_e q v_e }

\mathrm{ \text { and } \quad J_h=n_h q v_h }

\mathrm{ \frac{j_e}{J_h}=\frac{n_e}{n_h} \times \frac{v_e}{v_n} }

\mathrm{ \Rightarrow \frac{3 / 4}{1 / 4}=\frac{n_e}{n_h} \times \frac{5}{2} }

\mathrm{ \Rightarrow \frac{n_e}{n_h}=\frac{6}{5}}

Hence option 1 is correct.






 

Posted by

shivangi.shekhar

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