alleryThe speed of an EM wave in vacuum equals:
A$1/\sqrt{\mu_0\varepsilon_0}$, approximately $3\times 10^8$ m/s
B$\mu_0\varepsilon_0$, the product of two constants here
C$\sqrt{\mu_0\varepsilon_0}$, the square root of the product
D$\mu_0/\varepsilon_0$, the ratio of the two constants directly
Answer & Solution
Correct answer: A. $1/\sqrt{\mu_0\varepsilon_0}$, approximately $3\times 10^8$ m/s
$c = 1/\sqrt{\mu_0\varepsilon_0} \approx 3\times 10^8$ m/s in vacuum.
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