Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 27 - Early Quantum Theory and Models of the Atom - Questions - Page 797: 26

Answer

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Work Step by Step

Figure 27-24 shows the Balmer series for hydrogen, the wavelengths of light emitted by electrons as they fall from a high energy level down to the n=2 level. Figure 27–29 shows that as n increases, the energy levels become closer and closer together. For electrons that begin from any of these closely-spaced energy levels and drop down to the n = 2 level, the energies of emitted photons, and thus their wavelengths, are going to be very similar. These correspond to the closely-spaced spectral lines at the top of Figure 27-24. In summary, the radiation from downward electron transitions that start at the closely-spaced energy levels in Figure 27-29 correspond to the closely-spaced spectral lines in Figure 27–24.
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