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What does E stand for in E = mc²?

Answer and explanation

Correct answer: Energy

In Einstein’s equation E = mc², E stands for energy. The equation describes mass–energy equivalence: m denotes mass, c denotes the speed of light, and c² is the square of that speed. Energy is a measurable physical quantity and its SI unit is the joule. The distractors represent other quantities, but their usual symbols are different. Force is commonly written as F, electric current as I, and distance may be written as d or s, depending on the context. Therefore, option A is correct because it gives the accepted meaning of E in this equation, not merely a word associated with Einstein’s scientific work.

Related tags

EinsteinEnergyPhysics SymbolsMass-Energy EquivalenceBiography Of Albert EinsteinA Truly Beautiful MindEnglishClass 9 Mcq

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