(a) Write the expression for the speed of light in a material medium of relative permittivity & and relative magnetic permeability mu_(r). (b) Write the wavelength range and name of the electromagnetic waves which are used in (i) radar systems for aircraft navigation, and (a) earth satellites to observe the growth of the crops.

(a) Write the expression for the speed of light in a material medium o

1.	(a) Write the expression for the speed of light in a material medium of relative permittivity & and relative magnetic permeability mu_(r). (b) Write the wavelength range and name of the electromagnetic waves which are used in (i) radar systems for aircraft navigation, and (a) earth satellites to observe the growth of the crops.
Answer» Solution :(a) Speed of LIGHT in a material medium of relative permittivity E, and relative magnetic permeability `mu,` is given as `v=(1)/sqrt(in_(0) in_(r) mu_(0) mu_(r))=e/sqrt(in_(r) mu_(r))` (b) (i) Electromagnetic waves used in radar systems are microwaves whose wavelength varies from 1 MM to 10 cm. (ii) Infrared waves are used in remote sensing EARTH satellites and their wavelength range is from 700 nm to 1 mm.

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