3.3 and 3.9. If you have no idea whether a diode is on or off, try all possibilities (in this case there would be four). Then check if your initial assumption is consistent with the currents and voltages you obtained.
3.19. Set up a system of (two) equations using formula (3.3) and the values of currents and voltages given in the problem. Then solve it for the unknown current. Or try using one of the formulas on p. 134.
3.21. Set up a system of (two) equations using formula (3.3) and the values of currents and voltages given in the problem. Solve the system for n and Is.
3.32. Try reading about the diffusion current (pp.140-141) and doped semiconductors (pp.141-142). Pluck from there formulas of use.
3.36. Temperature dependence of ni given in (3.6) as well as the portion of text about doped semiconductors (pp. 141-142) will be useful here.
3.50. You will probbly find section The Forward-Bias Region beginning
on page 132 useful here. In particular p. 134.
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ELEG 309 Matters
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