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I have problems to solve the questions
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Hello,

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From the question list:

2 Find the resistivity of n – type germanium at 300K with a donor concentration,​

Nd= 5x10 17 atoms/m3.​

Given: μ n = 3900 cm2/V-s, e = 1.6 x 10 -19 C.​

​

​

3 A Si diode carries a current of 10 mA when a forward bias of 0.72 V is applied​

at 300K (27 ° C). Find​

i. The reverse saturation current​

ii. The bias voltages required for diode currents of 1 mA and 100​

mA. Comment on these two voltages.​

iii. Reverse saturation current at 57 ° C.​

​

​

4 The primary is connected to the power mains: 220V, 50Hz. The turns ratio of a​

transformer used in a half- wave rectifier is such that the peak voltage across​

the secondary winding of a transformer is 18V. Assuming the diode resistance​

in forward bias to be zero. Calculate the (i) dc voltage across the load (ii) value​

of ac voltage across the load.​

​

​

5 a. Calculate the value of I E in a transistor for which β = 50 and I B = 15 μ A. [1]​

b. Why is collector current slightly less than emitter current?​

Bertus