2.1 A transmission line of length / connects a load to a sinusoidal

voltage source with an oscillation frequency f. Assuming that the

velocity of wave propagation on the line is c, for which of the

following situations is it reasonable to ignore the presence of the

transmission line in the solution of the circuit?

a. = 20 cm, f = 20 kHz

b. 150 km, f= 60 Hz

c. = 20 cm, f = 600 MHz

d. 11 mm, f= 100 GHz