An $N$-type and $P$-type silicon can be obtained by doping pure silicon with
A
Arsenic and Phosphorous
B
Indium and Aluminium
C
Phosphorous and Indium
D
Aluminium and Boron
[EAMCET (Med.) 2000]
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C
Phosphorous and Indium
Phosphorus is pentavalent while Indium is trivalent.
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For a thermionic emitter (metallic) if $J$ represents the current density and $T$ is its absolute temperature then the correct curve between $\log _e \frac{J}{T^2}$ and $\frac{1}{T}$ is
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