Question:

What is the speed of light in free space?

A3.5 ×10⁸ m/s

B3 ×10⁸ m/s

C3 ×10⁹ m/s

D3.5 ×10⁹ m/s

Answer:

B. 3 ×10⁸ m/s

Explanation:

Speed of light:

  • The speed of light is dependent on the refractive index of the medium it is travelling in.

  • The higher the refractive index of the medium, the lower is the speed of light.

  • Hence, the speed of light in a medium is inversely proportional to the refractive index of the medium in which it is travelling through.

  • The denser a medium, the more is its refractive index and thus, the lesser is the speed of light.

  • The speed of light is thus minimum in solids as they are denser and will be maximum in a vacuum as a vacuum is the least dense medium.

  • Speed of light in free space / air is 3 ×10⁸ m/s


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