Chapter 38. Photons: Light Waves Behaving as Particles. Goals for Chapter 38. To consider the fundamental constituent of light, the photon To study the removal of an electron by an incident photon, the photoelectric effect
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Photons: Light Waves Behaving as Particles
(a) Since l′ is 1% longer, l′ – l = 0.01l, so solving for f,
(b) The photon energy lost in the scattering is
That is the same energy gained by the particle.
Note max change in wavelength is for “head-on” collision (f= 180),
initially far apart, move toward each other at the
same speed. They collide head-on, annihilating
each other and producing two photons. Find the
energies, wavelengths and frequencies of the two
photons if the initial kinetic energies of the two are
(a) negligible, or (b) both 5.00 MeV.
(a) In this case, the energies of the particles are each
just their rest masses mc2, so each photon has that energy.