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(1) Calculate the impedance (Z) in free space. (2) The result in (1) means the impedance...

(1) Calculate the impedance (Z) in free space.

(2) The result in (1) means the impedance for a plane wave in a lossless medium (i.e. zero conductivity). When we assume the value obtained in (1) is same as that of ‘dry air’, an impedance of ‘wet air’ decreases slightly. Note that the impedance in free space has some finite value as obtained in (1). It is not infinite although there is nothing in the medium. Explain the reason for which the impedance in free space cannot be infinite or zero.

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