9 A linearly polarised plane electromagnetic wave of wavelength 450 nm is incident normally on the surface of a metal with electrical conductivity 1.69x 10² (Ohm m)-¹. a) Find the skin

depth of the wave when it is inside the metal. 10 b) Find the phase speed of the wave when it is in this metal. [5] [5] c) Find how much energy of the incident wave in terms of percentage has been lost in the metal. Can the metal be used to make a good mirror? d) If the angle of incidence is 45°, find the angle of refraction. [5] [5] a) What is a Tee junction? Write down the types of the Tee junction based on the construction. [5] b) What is a Magic Tee? Explain the function of ports and different cases of signals entering and exiting at the ports of the Magic Tee. [5] c) What is the use of a radio-frequency (RF) Filter? Write down types of the RF filter based on the frequency of operation. [5] d) Draw and briefly describe the curves of Low-pass and High-pass filters. [5]