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10.7: Physical Constants
https://phys.libretexts.org/Courses/Berea_College/Electromagnetics_I/10%3A_Appendices/10.07%3A_Physical_Constants
The speed of light in free space ( $c$ ), which is the phase velocity of any electromagnetic radiation in free space, is $\cong 2.9979 \times 10^8$ m/s. The wave impedance of free space ( $\eta_0$ )...The speed of light in free space ( $c$ ), which is the phase velocity of any electromagnetic radiation in free space, is $\cong 2.9979 \times 10^8$ m/s. The wave impedance of free space ( $\eta_0$ ) is the ratio of the magnitude of the electric field intensity to that of the magnetic field intensity in free space and is $\sqrt{\mu_0/\epsilon_0}\cong 376.7~\Omega$ .

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