In Einstein's universe what is the fourth dimension:
Correct answer: C. Time
- A. Distance
- B. Speed
- C. Time
- D. Energy
Explanation
Einstein's theory of relativity introduced the revolutionary concept of spacetime, where the three dimensions of space are intertwined with the dimension of time, forming a four-dimensional continuum. This framework allows for the description of events based on four coordinates: three for space and one for time. Time, as the fourth dimension, is integral to understanding how objects move and interact in the universe, particularly under the influence of gravity.The incorrect options can be explained as follows: Distance and speed are related to spatial movement, but they do not represent dimensions in spacetime. Energy, while crucial in Einstein's theories, is not a dimension but rather a quantity that links mass through relativity.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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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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