A bipolar junction transistors (BJT) is characterized by various quantities, for example the thermal voltage (Vt), alpha (), beta (), and the BE threshold voltage (Vth ). (a) Describe the meaning of each of these quantities and give (approximate) associated numerical values. (b) Which one of these quantities is best suited to help us understand the physical operation of a BJT? Explain your answer. (c) Which one of these quantities is most relevant in the practice of BJTs? Explain your answer. (d) Which of these quantities depends strongly on a geometrical dimension (thickness of the base layer) of the BJT? Explain your