Practicing Success
Practicing Success
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If the ratio of the concentration of electrons to that of holes in a semiconductor is $\frac{7}{5}$ and the ratio of currents is $\frac{7}{4}$, then what is the ratio of their drift velocities? |
$\frac{7}{8}$ $\frac{4}{5}$ $\frac{5}{4}$ $\frac{4}{7}$ |
$\frac{5}{4}$ |
$\frac{I_e}{I_h}=\frac{n_eeAv_e}{n_heAv_h}⇒\frac{7}{4}=\frac{7}{5}×\frac{v_e}{v_h}=\frac{5}{4}$ |
