Radiation: Particles, Waves, Rays

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Presentation transcript:

Radiation: Particles, Waves, Rays Physics 202 Lecture 7 Radiation: Particles, Waves, Rays

Energy flow and intensity is related to the amplitude and power of the driving source http://www.acs.psu.edu/drussell/Demos/rad2/mdq.html

“Intensity level” recalibrates the definition of intensity to our physiological sensation http://acccn.net/Bio/book/Bio50/LecNotes/lecnot31.html http://en.wikipedia.org/wiki/Hertzsprung-Russell_diagram

Waves require a source and a medium made up of coupled oscillators near equilibrium Longitudinal Transverse http://www.acs.psu.edu/drussell/Demos/coupled/coupled.html http://en.wikipedia.org/wiki/Longitudinal_wave http://en.wikipedia.org/wiki/Transverse_wave

Any disturbance in the medium acts as a damped oscillator as energy radiates away Solid Liquid Gas Air

All the elements of the medium match the oscillation of the source with a phase shift

If the source is moving, the observed frequency suffers a Doppler shift http://en.wikipedia.org/wiki/Doppler_effect

When the frequencies of two sources differ, non-sinusoidal beats result Fourier Analysis

Energy propagates along “rays” which move perpendicular to the overall wave fronts Slow http://www.acs.psu.edu/drussell/Demos/radiation/radiation.html http://www.acs.psu.edu/drussell/Demos/rad2/mdq.html http://en.wikipedia.org/wiki/File:Earthquake_wave_shadow_zone.svg