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The ratio of electron and hole currents in a semiconductor is 7/4 and the ratio of drift velocities of electrons and holes is

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

(a) 5/7 

(b) 7/5 

(c) 25/49 

(d) 49/25

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Correct option  (b) 7/5

Explanation:

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