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Questions  

If the ratio  of concentration of electron to that of holes in  a semiconductor 9/11 and ratio of current 9/5  then what is the ratio  of their drift velocities?

a
115
b
511
c
1:1
d
83

detailed solution

Correct option is A

Drift velocity Vd=InAe⇒Vd∝In⇒VdeVdh=IeIh×nhne=95×119=115

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