Transmission line - 4

The characteristic impedance of a lossless transmission line is Z = 50 ohm. The phasor voltage is 

 Vs(z) = 100e^-j20 pi z - 100 e^j20 pi z V

 1) At z = 0, what is the phasor current?
2) What is the voltage reflection coefficient Gamma at z = 0? 
3) If the transmission is terminated at z = 0 by a load resistor, what is the load resistance R_L? 
4) What is the time average power delivered to the load resistor?
5) What are the instantaneous voltage V(z, t) and current I(z, t) of the line?



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