According to Einstein's theory of relativity, gravity is not an ordinary force, but aproperty of
Correct answer: C. Space-time geometry.
- A. Length contraction.
- B. Space-time interval.
- C. Space-time geometry.
- D. Mass-energy relation.
Explanation
According to Einstein's general theory of relativity, gravity is not an ordinary force but a result of the curvature of space-time geometry caused by mass and energy. Option C is correct as it reflects this concept. Length contraction (Option A) and space-time interval (Option B) are related to special relativity but do not describe gravity. Mass-energy relation (Option D) is a fundamental concept in relativity, expressing the equivalence of mass and energy, but it is not directly related to the nature of gravity.
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Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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