Who developed the theory of general relativity and the equation E=mc^2?

• A. Isaac Newton
• B. Nikola Tesla
• C. Albert Einstein
• D. Stephen Hawking

Answer: (C)

Albert Einstein is the figure who developed both ideas. General relativity reframes gravity as the curvature of spacetime produced by mass and energy, a theory Einstein published around 1915. The equation E=mc^2, showing that mass and energy are interchangeable (with energy equal to mass times the speed of light squared), comes from his work on relativity, and it highlights how even small amounts of mass embody enormous amounts of energy. Newton laid out gravity as a force in classical physics, while Tesla and Hawking made important contributions in other areas; they aren’t the originators of these two ideas.