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The ratio of electron and hole currents ...

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`

Text Solution

Verified by Experts

The correct Answer is:
B
`I = nA ev_(d) or Ipropnv_d`
`:. I_e/I_h = (n_ev_e)/(n_hv_h) or n_e/n_h = I_e/I_h xx v_h/v_e = 7/4 xx 4/5 = 7/5`
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DISHA PUBLICATION-SEMICONDUCTOR ELECTRONICS : METERIALS, DEVICES AND SIMPLE CIRCUITS-EXERCISE -1: CONCEPT BUILDER (TOPICWISE)
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