Distilled water at 25°C is characterized by σ = 1.7 x 10-4 mho/m and ε = 78 ε0 at a frequency of 3 GHz. Its loss tangent is (ε = 10-9/36p F/m)

• A. 1.3 x 10-5
• B. 1.3 x 10-3
• C. 1.7 x 10-4/78
• D. 1.7 x l0-4/78ε0