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The velocity of an electromagnetic wave in a medium is 2 cross times 10 to the power of 8 end exponent m S to the power of negative 1 end exponent If the relative permeability is 1 the relative permittivity of the medium is open parentheses C subscript 0 end subscript equals 3 cross times 10 to the power of 8 end exponent m S to the power of negative 1 end exponent close parentheses

  1. 2.25    
  2. 1.5    
  3. 4/9    
  4. 2/3    

The correct answer is: 2.25

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