In a $P$-type semi-conductor, germanium is dopped with
A
Gallium
B
Boron
C
Aluminium
D
All of these
[MH CET 2003]
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D
All of these
Gallium, boron and aluminum are trivalent.
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In a triode amplifier, $\mu=25, r_p=40$ kilo ohm and load resistance $R_L=10$ kilo ohm. If the input signal voltage is $0.5$ volt, then output signal voltage will be
Plate resistance of two triode valves is $2 k \Omega$ and $4 k \Omega$, amplification factor of each of the valves is $40.$ The ratio of voltage amplification, when used with $4 k \Omega$ load resistance, will be