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Chapter 3: Chapter 11 · PHYSICS PART-2 · EN medium
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(v/c) << . At very high speeds when (v/c ) is comparable to (though always less than) , we come to the relativistic domain where the following formulae are valid: Relativistic momentum p = m v Total energy E = m c Kinetic energy K = m c – m c , where the relativistic mass m is given by / v c m0 is called the rest mass of the particle. These relations also imply: E = (p 2c + m c4) / Note that in the relativisitc domain when v/c is comparable to , K or energy ! m 0c (rest mass energy). The rest mass energy of electron is about . MeV. Thus a kinetic energy of MeV, being much greater than electron’s rest mass energy, implies relativistic domain.
📖 NCERT Class 12 Physics Part 2 · Page 242
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(v/c) << . At very high speeds when (v/c ) is comparable to (though always less than) , we come to the relativistic domain where the following formulae are valid: Relativistic momentum p = m v Total energy E = m c Kinetic energy K = m c – m c , where the relativistic mass m is given by / v c m0 is called the rest mass of the particle. These relations also imply: E = (p 2c + m c4) / Note that in the relativisitc domain when v/c is comparable to , K or energy ! m 0c (rest mass energy).
The rest mass energy of electron is about . MeV. Thus a kinetic energy of MeV, being much greater than electron’s rest mass energy, implies relativistic domain. Using relativistic formulas, v (for MeV kinetic energy) = .
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