Very large, hot stars—much hotter than our sun—can be identified by the way in which He+ ions in their atmosphere absorb light. What are the three longest wavelengths, in nm, in the Balmer series of He+?
Atmospheric gases absorb light in a variety of spectral regions, most commonly in broad bands.
The Balmer series is a set of quantum transitions from the nth level (n>2) to the m=2 state.
We have (38.41) from the book's eq.
With Z=2 for and we have the transition wavelenghts from (38.40)
The first three energy levels of the fictitious element X were shown in FIGURE P38.56. An electron with a speed of 1.4 X 106 m/s collides with an atom of element X. Shortly afterward, the atom emits a photon with a wavelength of 1240 nm. What was the electron's speed after the collision? Assume that, because the atom is much more massive than the electron, the recoil of the atom is negligible. Hint: The energy of the photon is not the energy transferred to the atom in the collision.
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