Round 5: Tossup 7

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

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