Class 11 Physics Work Energy Power The Equivalence of Mass and Energy

The Equivalence of Mass and Energy

  • Physicists believed that in every physical and chemical process, the mass of an isolated system is conserved till Albert Einstein show the relation , E = m c2 where c, the speed of light in vacuum is approximately 3 ×108 m s–1.
  • This equation showed that mass and energy are equivalent and are related by E = m c2 .
  • If there is a difference between the sum of reactants and products that differene, Dm, is called mass defect.
  • In case of chemical reactions the mass defect is very small and can be neglected, but in the case of nuclear reactions this becomes significant.

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