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Department of Physics & Astronomy: Home

www.physics.ucr.edu/

... of energy in solar cells. The design incorporates a heat engine photocell that absorbs photons from the sun and converts the photon energy into electricity. Read the whole article here .  OUR COSMIC ORIGINS: Stars, Galaxies, and the Stuff ...


What is the mass of a photon?

www.math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass ...

... general equation, and that makes it very useful. Is there any experimental evidence that the photon has zero rest mass? Alternative theories of the photon include a term that beh-aves like a mass, and this gives rise to the very advanced ...


The Human Eye and Single Photons

www.math.ucr.edu/home/baez/physics/Quantum/see_a_photon.html

... eye is very sensitive but can we see a single photon?  The answer is that the sensors in the retina can respond to a single photon.  However, neural filters only allow a signal to pass to the brain to trigger a conscious response when at ...


Photons, Schmotons

www.math.ucr.edu/home/baez/photon/schmoton.htm

Photons, Schmotons Photons, Schmotons John Baez and Michael Weiss 1997-2002 Did you ever wonder "What the heck is a photon, anyway?" Well, this question quickly gets you into pretty deep waters. Not only do you need to understand Maxwell ...


Photons, Schmotons

www.math.ucr.edu/home/baez/photon/

Photons, Schmotons Photons, Schmotons John Baez and Michael Weiss 1997-2002 Did you ever wonder "What the heck is a photon, anyway?" Well, this question quickly gets you into pretty deep waters. Not only do you need to understand Maxwell ...


The Casimir Effect

www.math.ucr.edu/home/baez/physics/Quantum/casimir.html

... in agreement with the theory to within the experimental uncertainty of 5%. Particles other than the photon also contribute a small effect but only the photon force is measurable.  All bosons such as photons produce an attractive Casimir ...


Michael Weiss: Hmm, homework on the weekend!

math.ucr.edu/home/baez/photon/hw-week.htm

... the weekend! (grumble, grumble) Oh, well, beats cleaning out the attic (``Whaddya mean we have wasps!? Sure they're not photons?'') John Baez assigns: So maybe Mi-chael can remember or figure out the formulas relating the p ...


John Baez: A Gaussian Bump

math.ucr.edu/home/baez/photon/gaussian.htm

... the coherent state e -icp |0>. This should shed some more light (pardon the pun) on why our previous computations gave a photon density proportional to the amplitude squared and thus the energy density. The thing to understand is why, ...


John Baez: A Six-Step Program

math.ucr.edu/home/baez/photon/six-step.htm

... took the classical formula for the energy density of the electromagnetic field, and the quantum formula for the energy of a photon of a given frequency, combined them, and used that to guess the photon density of a plane wave. This is ...


John Baez, Michael Weiss: In Boston, you should definitely co ...

math.ucr.edu/home/baez/photon/boston.htm

... 1+1 dimensions - will be but a pale imitation of Nature's wondrous "photons" - mass-less spin-1 particles in 3+1 dimensions. Nonetheless, once Michael understands fotons, photons will be pretty easy. In the last episode, Michael and ...


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