Q:
      
      
         
            
In a bipolar junction transistor
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) the base has the least concentration of impurity         
         
Explanation: In terms of concentration of impurity (a.k.a impurity doping concentration, often abbreviated to doping concentration), from the highest to the lowest among the three regions of a bipolar junction, emitter, collector, and base are the correct order. The above order is independent of the type of BJT, npn or pnp
       
      
      
      
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