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Q.

The contribution  in the total current flowing through  a semiconductor due to electrons and holes are ¾ and ¼ , respectively. If the drift velocity  of electrons is 5/2 times that  of  holes  at  this  temperature,   then  the  ratio  of concentration of electrons and holes is

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a

6 : 5

b

5 : 6

c

3 : 2

d

2 : 3

answer is A.

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Detailed Solution

As we know current density J = nqv⇒Je=neqve  and  Jh=nhqvh⇒JeJh=nenh×vevh⇒3/41/4=nenh×520⇒nenh=65
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