Rest mass energy of an electron is:
Correct answer: A. 0.511 MeV
- A. 0.511 MeV
- B. 1 MeV
- C. 8.0x10 J
- D. None of the above
Explanation
Eo=moc^2Where,c2= velocity of light which is 3×10^8 m/smo=rest mass of an electron which is 9.11×10−31 kgEo=rest mass energyPut value of rest mass of an electron and velocity of light in above equation,We get,Eo=9.11×10−31 × (3×10^8)^2Solve this we get,Eo=8.91×10^−14 JWe can convert joule into eV, as our options are also in eV.We know that, 1J=1.6×10−19 eVEo= (8.91×10^−14) / (1.6×10^−19 eV)Eo =0.511MeV
This question appeared on the ETEA MDCAT 2006 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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