Elecromagnetic waves travel in a medium with a speed of `2xx10^(8)m//s`.The relative permeability of the medium is 1. What is the relative permittivity of the medium-

Explanation

Speed of light in a medium can be written as follows:
` v= (1)/( sqrt(mu epsi))= (1)/( sqrt(mu_r mu_0 epsi_r epsi_0 ) ) = (c ) /( sqrt( mu _r epsi_r ))`
`implies v^2 = ( c^2 )/( mu_r epsi_r)`
`implies epsi_r =( c^2 )/( mu _r v^2) = ( 9 xx 10 ^(16 ))/( 1 xx 4xx 10^(16)) = 2.25`