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What does c mean in E = mc²?

Answer and explanation

Correct answer: Speed of light

The correct answer is C, the speed of light. In E = mc², c denotes the speed of light in a vacuum, approximately 3 × 10⁸ metres per second. The exponent 2 means that this speed is squared, or multiplied by itself. Its very large value helps explain why a small amount of mass can correspond to a very large amount of energy. The speed of sound is much lower and depends on the medium and temperature, while waves in water have their own variable speeds. Air pressure is a different physical quantity and has no role in this equation. Therefore option C is the only scientifically accurate answer.

Related tags

Speed Of LightE=Mc²PhysicsEinsteinBiography Of Albert EinsteinA Truly Beautiful MindEnglishClass 9 Mcq

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