Question

Considering the speed of light in a medium, pick the odd one out.

• A. $1.25\times {10}^8{\text{m s}}^{-1}$
• B. $4.7\times {10}^8{\text{m s}}^{-1}$
• C. $2.8\times {10}^8{\text{m s}}^{-1}$
• D. $5.3\times {10}^7{\text{m s}}^{-1}$

Answer 1

The correct option is B $4.7\times {10}^8{\text{m s}}^{-1}$

Light travels faster in space, than any other known object in the Universe, at an astonishing speed of $3\times {10}^8{\text{m s}}^{-1}$. In other words, no medium other than vacuum (space) is known to allow light to propagate through it at a speed greater than $3\times {10}^8{\text{m s}}^{-1}$. Therefore, $4.7\times {10}^8{\text{m s}}^{-1}$ is an impossible value of the speed of light in any medium.