In photodiode, it is illuminated by light radiations, which in turn produces electric current.
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In a transistor, a change of $8.0 mA$ in the emitter current produces a change of $7.8 mA$ in the collector current. What change in the base current is necessary to produce the same change in the collector current
Carbon, silicon and Germanium atoms have four valence electrons each. Their valence and conduction band are separated by energy band gaps represented by $(E) .(E)$ and $(E)$ respectively. Which one of the following relationship is true in their case