Rest man energy of an electron is:
Correct answer: A. 0.511 MeV
- A. 0.511 MeV
- B. 1 MeV
- C. 8.0 x 10^-14 J
- D. None of the above
Explanation
The rest mass energy of a particle is calculated by the formula E = mc2, where m is the rest mass and c is the speed of light. For an electron, this works out to be approximately 0.511 MeV. Option A is correct because it provides this value in MeV, the unit typically used in particle physics. Option B is incorrect because it overestimates the energy. Option C provides the equivalent energy in joules, which is a correct value but not in the unit asked. Option D is incorrect because the correct answer is indeed present in the options.
This question appeared on the ETEA MDCAT 2008 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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