Question

If the ratio of the concentration of electron to that of holes in a semiconductor is 7/5 and the ratio of current is 7/4, then what is the ratio of their drift velocities?
(A) 4/5 (B) 5/4 (C) 4/7 (D) 5/8

Answer 1

The correct answer is option B.

Good Luck..

Answer 2

Dear Student,

◆ Answer - (B)

ve/vn = 5/4

● Explanation -

# Given -

Ne/Nn = 7/5

Ie/In = 7/4

# Solution -

Ratio of drift velocities is given by -

ve/vn = (Ie/Ne) / (In/Nn)

ve/vn = (Ie × Nn) / (In × Ne)

ve/vn = (Ie/In) / (Ne/Nn)

ve/vn = (7/4) / (7/5)

ve/vn = (7 × 5) / (7 × 4)

ve/vn = 5/4

Hence, ratio of drift velocities is 5/4.

Thanks dear. Hope this helps you...