Round 5: Tossup 7

This interaction is described by a gauge theory with the U(1) (“U one”) symmetry group, which has been successfully tested by measuring the Lamb shift. Tomonaga, Schwinger, and Feynman shared the 1965 Nobel Prize in Physics for developing this interaction’s quantum field theory, known as QED. Weinberg–Salam (15[1])theory predicts that, before the quark epoch, this interaction and the (*) weak force (10[1])were unified. This interaction is described by the four Maxwell equations, and its namesake (10[1])“spectrum” (-5[1])of radiation (10[2])ranges from radio to gamma-rays. (10[2])For (-5[1])10 points, photons mediate (-5[1])what fundamental force (-5[1])with a portmanteau name? ■END■ (10[6]0[5])

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