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What does E mean in E = mc²?

Answer and explanation

Correct answer: Energy

The correct answer is C, energy. In the equation E = mc², the capital letter E denotes energy, m denotes mass, and c denotes the speed of light in a vacuum. The equation is meaningful only when each symbol is read according to its scientific definition. Distance is often represented by d, time by t, and force by F in elementary physics, although symbols can vary in specialised contexts. In this particular equation, however, E has the established meaning energy. The other options name physical quantities but do not match the notation used here. Therefore option C is correct, and recognising the symbols also helps students understand the mass–energy relationship rather than memorising the equation as an unexplained string.

Related tags

EnergyE=Mc²Scientific SymbolsEinsteinBiography Of Albert EinsteinA Truly Beautiful MindEnglishClass 9 Mcq

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