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    Question

    What discovery did Henry Cavendish report in 1798?

    A The value of the gravitational constant Correct Answer Incorrect Answer
    B The concept of mass-energy equivalence Correct Answer Incorrect Answer
    C Radioactivity Correct Answer Incorrect Answer
    D The principle of conservation of energy Correct Answer Incorrect Answer

    Solution

    Sol. Henry Cavendish measured the value of the gravitational constant in 1798. His experiment provided insights into Earth's mass and density and confirmed Newton's law of gravitation. Information Booster:

    • The main instrument used in Cavendish’s experiment was a "torsion balance."
    • He measured the gravitational force.
    • This experiment also estimated Earth's density.
    • Cavendish’s contribution was revolutionary for physics and astronomy.
    • It became the foundation for modern gravitational studies.
    ---:
    • Mass-energy equivalence: Proposed by Albert Einstein.
    • Radioactivity: Pioneered by Marie Curie.
    • Conservation of energy: A key principle of thermodynamics.

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