The keynote of Einstein's theory of relativity is that gravity is a property of
Correct answer: C. space-time geometry
- A. length-contraction
- B. space-time interval
- C. space-time geometry
- D. mass-energy equivalence
Explanation
Einstein's theory of relativity transformed the understanding of gravity from a force acting at a distance, as in Newtonian physics, to an effect of the curvature of space-time. This curvature is created by mass and energy, which alter the geometry of space-time itself, causing objects to follow curved paths. This is why the correct answer is space-time geometry. The other options-length-contraction, space-time interval, and mass-energy equivalence-are important concepts in relativity but do not specifically describe gravity as space-time geometry does.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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