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Q.

The velocity of light in vacuum is


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a

3 ×108 ms-1

b

5 ×108 ms-1

c

3 ×105 ms-1

d

6 ×108 ms-1 

answer is A.

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Detailed Solution

The velocity of light in vacuum is 3 ×108 ms-1.
The speed of light is measured to have the unchanged value of c = 3 ×108 m/s. Light moves at the same speed as everyone because the laws of electromagnetism are equivalent for everyone, which includes the values of the constants in those laws. Albert Einstein's special theory of relativity eminently dictates that no identified object can travel faster than the speed of light in a vacuum.
 
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