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Home > Basic Physics Measurements > Question

In E=mc², what is 'c'?

0
A) Radius of earth
B) Electric power of cell
C) Velocity of voice
D) Velocity of light

Correct Answer: D) Velocity of light

• In Einstein's mass-energy equivalence equation E=mc², 'c' represents the Velocity of light in a vacuum. • The speed of light in a vacuum is approximately 300,000 kilometers per second ($3 \times 10^8$ m/s). • 'E' represents total energy, while 'm' represents the rest mass of the object. • Albert Einstein published this groundbreaking formulation in his 1905 paper on Special Relativity.

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