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]