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The speed of light is defined as the speed with which a light photon travels in the vacuum. It is denoted by the alphabet c and measured using SI unit m/s. The value of velocity of light or value of c is a constant at any part of the universe. This physical constant has multiple applications at various disciplines of physics.

Speed of Light

The velocity of the light in the vacuum or air:

The speed of light c = 299792458 m/s ≅ 3 × 108 m/s.

The velocity of light can be expressed in terms of mph or km/s. That is-

  • The speed of light in mph 186,000 miles per hour.
  • The speed of light in air is 299792 km/s.

Hope you have learned the value of c or the value of the speed of light in vacuum along with units of velocity.

Physics Related Topics:

Mu Naught Value
Epsilon Naught Value
Value Of Electron
Value Of Planck’s Constant

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Frequently Asked Questions – FAQs

Q1

Define speed of light.

Speed of light is defined as the speed with which a light photon travels in a vacuum.
Q2

How is speed of light measured?

The speed of light is measured by using SI unit m/s.

Q3

Is value of velocity of light constant?

Yesthe value of velocity of light is constant.
Q4

What is the velocity of the light in the vacuum?

Velocity of the light in the vacuum is = 299792458 m/s ≅ 3 × 108 m/s
Q5

What is the speed of light in air?

The speed of light in air is 299792 km/s.
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