Question

The wave impedance of free space is

• A. 183 $\Omega$
• B. 273 $\Omega$
• C. 405 $\Omega$
• D. 363 $\Omega$

Answer 1

In case of dielectric (conductivity = 0) wave impedance of free space $Z_0=\sqrt{\frac{\mu }{{\epsilon }_0}}$ For free space, $\mu =4\pi \times {10}^{-7}H/m$ and ${\epsilon }_0=8.54\times {10}^{-12}F/m$ so, $Z_0\simeq 377\Omega$