E (eV) n=3 -2.0 n= 2- -3.0 n=1 -6.5 FIGURE P29.59
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The first three energy levels of the fictitious element X are as shown.
a. What wavelengths are observed in the absorption spectrum of element X? Give your answers in nm.
b. State whether each of your wavelengths in part a corresponds to ultraviolet, visible, or infrared light.
c. An electron with a speed of 1.4 × 106 m/s collides with an atom of element X. Shortly afterward, the atom emits a 1240 nm photon. What was the electron’s speed after the collision? Assume that, because the atom is so much more massive than the electron, the recoil of the atom is negligible.
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