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NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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In a transistor the collector current is always less than the emitter current because

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Correct option: B

A few electrons are lost in the base and only remaining ones reach the collector

Option B (A few electrons are lost in the base and only remaining ones reach the collector) is correct because some of the electrons injected from the emitter recombine with holes in the base region, reducing the number of electrons that reach the collector.

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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}.

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}}

P

side and donor impurity concentration of

{10^{16}}

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

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}}