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What does m represent in E = mc²?

Answer and explanation

Correct answer: Mass

The correct answer is mass. In E = mc², the lowercase letter m stands for mass, while E stands for energy and c stands for the speed of light in a vacuum. The equation expresses equivalence: mass can be regarded as a concentrated form of energy, and under suitable physical conditions mass and energy can be converted into each other. Option A is incorrect because energy is represented by E. Option C is incorrect because the speed of light is represented by c. Time is not one of the symbols in this equation, so option D is also wrong. Therefore, option B is the only correct choice.

Related tags

MassEinsteinE=Mc²Energy EquivalenceBiography Of Albert EinsteinA Truly Beautiful MindEnglishClass 9 Mcq

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