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11. Radiation

11. Radiation. What is radiation?. Radiation sources. Antenna: radio waves, microwaves. Atoms, molecules: light, infrared light, UV, X-rays. Nuclei: Gamma rays. We shall consider:. Point-like source at rest with time-dependent charge distribution. Accelerated point charge. radiation zone.

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11. Radiation

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  1. 11. Radiation

  2. What is radiation?

  3. Radiation sources Antenna: radio waves, microwaves Atoms, molecules: light, infrared light, UV, X-rays Nuclei: Gamma rays We shall consider: Point-like source at rest with time-dependent charge distribution Accelerated point charge

  4. radiation zone long wavelength limit Point-like source d

  5. Multipole expansion

  6. Acoustic monopole fields do exist. Radiation fields No em monopole fields Dipole fields

  7. Radiated power

  8. Why is the sky blue?

  9. Holds in general if Oscillating dipole

  10. Radiation from a moving point charge

  11. Holds also for velocities small as compared to c.

  12. Arbitrary velocity Power radiated by the charge Lienard’s formula

  13. Bremsstrahlung v and a are parallel

  14. First commercial X-ray tube 1896 Wilhelm Conrad Roentgen discovered X-rays 1895 Nobelprice 1901

  15. 1896 1960

  16. Synchrotron radiation

  17. BESSY synchrotron X-ray source in Berlin

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