A) Diamond
B) Water
C) Vacuum
D) Hydrogen
Correct Answer: C
Solution :
The velocity of light is maximum in vacuum. It is close to 2.99792458 x 108 m/s. A vacuum is a region with no matter in it; there are no particles, no material medium, nothing. So, there is no reflection, refraction, diffraction, etc. That is why it travels the fastest in vacuum.
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