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What does m stand for in E = mc²?

Answer and explanation

Correct answer: Mass

The direct answer is A: m stands for mass. In Einstein’s equation E = mc², E represents energy, m represents mass, and c represents the speed of light in vacuum. The equation expresses mass–energy equivalence: under suitable physical conditions, mass and energy are related and can be converted into one another. The factor c² is extremely large because the speed of light is very large, so even a small amount of mass corresponds to a very large amount of energy. B is incorrect because time is commonly represented by t in elementary formulas. C is incorrect because height is often represented by h, although symbols can vary in different contexts. D is incorrect because temperature is commonly written as T. The question asks specifically about the standard meaning of m in this famous equation, not about every possible use of the letter in science. A useful memory cue is “m = matter or mass,” while “c = light speed” and “E = energy.”

Related tags

EinsteinMassE=Mc²Physics SymbolsA Truly Beautiful MindClass 9 McqBiography Of Albert EinsteinEnglish

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