Mass-Energy relation given by Einstein in represented as: ____________?
Correct answer: A. E=mc²
- A. E=mc²
- B. E=hf
- C. E=m²c
- D. E=mv²
Explanation
Einstein's mass-energy relation states that the energy equivalent of mass m is E = mc², where c is the speed of light in m/s. E = hf is the photon energy relation, so students may choose it by confusing mass-energy equivalence with energy of radiation.
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About Quantum Theory and Radiation
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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