By Franco Selleri

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1/λ, where λ is the wavelength in centimeters. b) Wavenumber characterizes the light that has photons of the designated energy. E = hν = hc/λ = hcν˜ . (where c is given in cm/s). 034 × 1022 cm−1 . Clearly, this is light of an extremely short wavelength since more than 1022 wavelengths ﬁt into 1 cm. 000 eV, the above equation is repeated using h in eV s. This gives ν˜ = 8065 cm−1 . 1-7 The Wave Nature of Matter Evidently light has wave and particle aspects, and we can describe it in terms of photons, which are associated with waves of frequency ν = E/ h.

The changes in electric and magnetic ﬁelds propagate outward with a characteristic velocity c, and are describable as a traveling wave, called an electromagnetic wave. Its frequency ν is the same as the oscillation frequency of the vibrating charge. Its wavelength is λ = c/ν. Visible light, infrared radiation, radio waves, microwaves, ultraviolet radiation, X rays, and γ rays are all forms of electromagnetic radiation, their only difference being their frequencies ν. We shall continue the discussion in the context of light, understanding that it applies to all forms of electromagnetic radiation.

Since E is a constant, the solutions of the Schr¨odinger equation must be more wiggly in regions where V is low and less wiggly where V is high. Examples for some one-dimensional cases are shown in Fig. 1-13. In the next chapter we use some fairly simple examples to illustrate the ideas that we have already introduced and to bring out some additional points. 1-12 Summary In closing this chapter, we collect and summarize the major points to be used in future discussions. 1. Associated with any particle is√a wavefunction having wavelength related to particle momentum by λ = h/p = h/ 2m(E − V ).