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According to quantum electrodynamics, there is a small but finite probability that two photons may scatter...

According to quantum electrodynamics, there is a small but finite probability that two photons may scatter against each other. Suppose two photons, with wavelengths λ1 and λ2, collide head-on. Compute the wavelength of one of the photons after the collision, if its scattering angle is θ. (The energy of a photon with wavelength λ is ̄hω, where ω = 2πc/λ.)

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