Question: A time-harmonic plane electromagnetic wave undergoes an attenuation when it travels inside a material where there are losses, such as inside a conductor. If Em(0)

A time-harmonic plane electromagnetic wave undergoes an attenuation when it travels inside a material where there are losses, such as inside a conductor. If Em(0) is the maximum amplitude of the wave on the plane z=0, which of the following expressions represents the maximum wave amplitude after traveling a distance z inside the material? 1. E subscript m left parenthesis z right parenthesis equals E subscript m left parenthesis 0 right parenthesis space e to the power of negative alpha space z end exponent 2. E subscript m left parenthesis z right parenthesis equals E subscript m left parenthesis 0 right parenthesis space e to the power of negative j space beta space z end exponent 3. E subscript m left parenthesis z right parenthesis equals E subscript m left parenthesis 0 right parenthesis space e to the power of negative j space 2 beta space z end exponent 4. E subscript m left parenthesis z right parenthesis equals E subscript m left parenthesis 0 right parenthesis space e to the power of negative 2 alpha space z end exponent

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