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Q.

The velocity of light in vacuum is

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a

3 \times 10^{8} {ms}^{- 1}

b

5 \times 10^{8} {ms}^{- 1}

c

3 \times 10^{5} {ms}^{- 1}

d

6 \times 10^{8} {ms}^{- 1}

answer is A.

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Detailed Solution

The velocity of light in vacuum is

3 \times 10^{8} {ms}^{- 1}

.
The speed of light is measured to have the unchanged value of

c = 3 \times 10^{8} 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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