(a) Refer to Figure Q6(a). Indicate which of the 9V 100mA lamps are bright, dim oroff. Give reasons to support your answer.[6 Marks] (b) Sketch the current, I, versus voltage,

V, characteristics curves for silicon andgermanium diodes. Conduction does not start until the forward biased voltage VFis about 0.6V for silicon and 0.1V for germanium. Also assume that the reversevoltage, VR, can be of value of 1000V for both diodes.[8 Marks] (c) In the circuit of Figure Q6(b), hFE = 100 for a bipolar junction transistor (BJT). Calculate the value of RB for the lamp current Ic to be 60MA. Assume the transistor's not saturated and that VBE = 0.6V.[8 Marks] (d) If the lamp shown in Figure Q6(b) has resistance RL100ohms, would the transistor be saturated?[3 Marks]