(a) Write the expression for the speed of light in a material medium of relative permittivity $ε$ _r and relative magnetic permeability $μ$ _r .
(b) Write the wavelength range and name of the electromagnetic waves which are used in
(i) radar systems for aircraft navigation, and
(ii) Earth satellites to observe the growth of the crops.

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Detailed Solution

(a) Speed of light in medium v,
$\frac{1}{\sqrt{μ \in}} = \frac{1}{\sqrt{μ_{0} μ_{r}} ε_{0} ε_{r}}$
(b) (i) Microwave range 0.1mt – 1mm (10^-3m – 10^-1m)
(ii) Infrared waves range 1 𝑚𝑚 − 700𝑛𝑚

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