The uncertainty in energy of the uncharged pi meson, expressed in eV is .[Rest ..... ...... energy =125 MeV, lifetime = 0.083 fs] * %3D О 10 O 7.9 O 7.8 O 7.7

(2.13) Selection rules in hydrogen Hydrogen atoms are excited (by a pulse of laser light that drives a multi-photon process) to a spe- cific configuration and the subsequent spontaneous emission is resolved using a spectrograph. Infra- red and visible spectral lines are detected only at the wavelengths 4.05 um, 1.87 µm and 0.656 µm. Explain these observations and give the values of n and l for the configurations involved in these transitions.

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The average lifetime of a Z boson is about 3.0 x 10 J Need Help? Read It -25 s. Estimate the minimum uncertainty in the energy of a Z boson.