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Q.

Among which of the following medium light travels fastest?


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a

Air

b

Vacuum

c

Water

d

Glass 

answer is B.

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Detailed Solution

Light travels fastest in a vacuum.
Although light behaves as both wave and particle but can propagate through mediums like air, water and space, and light travels fastest in a vacuum as other particles are absent in a vacuum which could hinder the propagation of light waves.
The speed of light in a vacuum is constant, which is 3 × 108 ms-1 and can be represented as ‘c’.
 
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