NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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{D_e}

{D_b}

and

{D_c}

are the doping levels of emitter, base and collector respectively of a transistor, then

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Correct option: D

{D_e}

{D_c}

{D_b}

Option D (

{D_e}

{D_c}

{D_b}

) is correct because the emitter is most heavily doped to supply the majority carriers, the collector is moderately doped to collect these carriers, and the base is lightly doped to minimize recombination.

More Questions from SEMI CONDUCTOR DEVICES

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Following is the relation between current and charge

I = A{T^2}{e^{q/{V_L}}}

, then value of

{V_L}

will be To measure light intensity we use The ratio of RMS output voltage of full wave rectifier and half wave rectifier is

\sqrt{n}.

The value of

n

is? (The input voltage is sine wave). The truth table shown in figure is for
A    0   0   1   1
B    0   1   0   1
Y    1   0   0   1  The average value of output direct current in a half wave rectifier is A

p - n\;

junction has acceptor impurity concentration of

{10^{17}}\mathrm{c}{\mathrm{m}^{ - 3}}

in the

P

side and donor impurity concentration of

{10^{16}}

\mathrm{c}{\mathrm{m}^{ - 3}}

in the

N

side. What is the contact potential at the junction? (

kT =

thermal energy, intrinsic carrier concentration

{n_i} = 1.4 \times {10^{10}}

\mathrm{c}{\mathrm{m}^{ - 3}}

)