Packet 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. (-5[1])Weinberg–Salam (15[1])theory predicts that, before the quark epoch, this interaction (-5[1])and the (*) weak force (10[1])were unified. (-5[1])This interaction (10[1]-5[1])is described by the four Maxwell equations, and its namesake (10[1])“spectrum” (-5[1])of radiation (10[2])ranges from radio (10[1])to gamma-rays. (10[3])For (-5[1])10 points, photons mediate (-5[1])what fundamental force (-5[1])with a portmanteau name? ■END■ (10[6]0[7])

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