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If the ratio of the concentration of electrons that of holes in a semiconductor is 7 5 and the ratio of currents is 7 4 , then what is the ratio of their drift velocities?

Options

  1. A4 7
  2. B5 8
  3. C4 5
  4. D5 4

Correct answer

D. 5 4

Step-by-step solution

n _ e n _ n = 7 5 l _ e l _ n = 7 4 ( V _ d )_ e ( V _ d )_ n l _ e l _ n n _ n n _ e = 5 4

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