Answer to Question 2

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(a)

f = ____1.4_____  = ____           1.4____________ = 12.7 Hz

      (R1 + 2R2)C      [10000 + (2 20000)] 2.2 10-6

 

(b) tH= 0.7(RA + RB)C = 0.7 (10000 + 20000) 2.2 10-6 = 0.0462 s

 

     tL = 0.7 RBC = 0.7 20000 2.2 10-6 = 0.0308 s

 

    Ratio = 0.0462 0.0308 = 1.5

 

(c)  It is not a square wave as the mark is 1.5 times the space.