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What scientific element does (c) in (E=mc^2) represent?

Answer and explanation

Correct answer: Speed of light

In the equation relating energy and mass, the letter c denotes the speed of light in a vacuum. It is a physical constant with a very large value, approximately \(3.0 \times 10^8\) metres per second. The equation shows that mass and energy are related, and the squared value of this constant explains why even a small amount of mass corresponds to a great amount of energy.

Thus, option A is correct. The other choices describe unrelated ideas: pitch belongs to sound, pressure of water concerns fluids, and weight of air concerns mass and gravity. In this formula, c is not a general symbol for any speed; it specifically represents the speed of light, while the exponent 2 means that this speed is squared.

Related tags

Speed Of LightFormulaEinstein

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