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Energy

Energy. An electron with no potential energy or kinetic energy has ____ total energy. zero positive negative. How fast?. A particle with mass ___ travel at speed c. Light ___ travel at speed c. can, can cannot, cannot can, cannot cannot, can. Energies.

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Energy

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  1. Energy • An electron with no potential energy or kinetic energy has ____ total energy. • zero • positive • negative

  2. How fast? • A particle with mass ___ travel at speed c. • Light ___ travel at speed c. • can, can • cannot, cannot • can, cannot • cannot, can

  3. Energies • Which of the following is true? • A particle’s rest energy cannot be greater than its kinetic energy. • A particle’s kinetic energy cannot be greater than its rest energy. • A particle’s kinetic energy cannot be greater than its total energy. • More than one of the above is true.

  4. PAL Week 6 Wednesday In SI units, the mass of an electron is 9.11X10-31 kg. In relativity-friendly units, the mass of an electron is 511 keV/c2. 1. An electron has speed 15,000 km/s (which is 5% of c). • Find its rest energy in J. 8.199e-14 J • Find its total energy in J. 8.209e-14 • Find its kinetic energy in J, using the relativistic equation. 1.0268e-16 • Find the % error incurred due to using the non-relativistic kinetic energy equation. 0.19%

  5. 2. An electron has speed 0.4 c. • Find its rest energy in eV. 511 keV • Find its total energy in eV. 557.5 keV • Find its kinetic energy in eV , using the relativistic equation.46.5 keV • Find the % error due to using the non-relativistic kinetic energy equation. 12%

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