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What does c stand for in E = mc²?

Answer and explanation

Correct answer: Speed of light

The direct answer is A: c stands for the speed of light, specifically the speed of light in vacuum in this equation. In E = mc², E is energy, m is mass and c is the speed of light. The superscript 2 means that c is squared, or multiplied by itself. Since this speed has a very large value, c² is an enormous factor, which explains why a small amount of mass can be associated with a very large amount of energy. B is incorrect because the speed of sound is a different quantity and changes according to the medium, such as air, water or a solid. C is a measurement of vertical distance in water and has no role in mass–energy equivalence. D refers to force per unit area in the atmosphere and is also unrelated. The memory cue is “c for constant cosmic light speed,” while sound speed depends on its medium.

Related tags

Speed Of LightEinsteinPhysicsMass-Energy EquivalenceA Truly Beautiful MindClass 9 McqBiography Of Albert EinsteinEnglish

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