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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicEasy2 minPYQ_2020

PhysicsEasysingle choice

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

Options:

Answer:

Solution:

Drift velocity $v_{d} = \frac{I}{nAe}$

$\frac{{(v_{d})}_{electron}}{{(v_{d})}_{hole}} = (\frac{I_{e}}{I_{h}}) (\frac{n_{h}}{n_{e}}) = \frac{7}{4} \times \frac{5}{7} = \frac{5}{4}$ .

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: PYQ_2020

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