The velocity of electromagnetic wave in free space or vacuum is
A. 3 × 10-8 ms-1
B. \(\sqrt{\mu_{\mathrm{o}} \varepsilon_{\mathrm{o}}}\) ms-1
C. \(\frac{1}{\mu_{r} \varepsilon_{r}}\) ms-1
D. \(\left(\varepsilon_{0} \mu_{0}\right)^{-1 / 2}\) ms-1
Answer:D
The velocity of electromagnetic wave in free space or vacuum is
A. 3 × 10-8 ms-1 B. \(\sqrt{\mu_{\mathrm{o}} \varepsilon_{\mathrm{o}}}\) ms-1 C. \(\frac{1}{\mu_{r} \varepsilon_{r}}\) ms-1 D. \(\left(\varepsilon_{0} \mu_{0}\right)^{-1 / 2}\) ms-1