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Most popular questions from this chapter

Compton scattering is relevant not only to x-ray photons but, even more so, to higher energy gamma-ray photons. Suppose a350keV gamma-ray photon backscatter (i.e., is scattered back toward the source) from a free electron. Afterward, what is the electronโ€™s velocity in m/s?

In the atom interferometer experiment of Figure 38.13, laser cooling techniques were used to cool a dilute vapor of sodium atoms to a temperature of 0.0010K=1.0mK. The ultracold atoms passed through a series of collimating apertures to form the atomic beam you see circling the figure from the left. The standing light waves were created from a laser beam with a wavelength of 590nm.

a. What is the rms speed vmeof a sodium atom (A-23)in a gas at temperature 1.0mK?

b. By treating the laser beam as if it were a diffraction grating. Calculate the first-order diffraction angle of a sodium atom traveling at the rms speed of part a.

c. how far apart are the points Band Cif the second sanding wave is 10cmfrom the first?

d. Because interference is observed between the two paths, each individual atom is apparently present at both points Band point CDescribe, in your own words, what this experiment tells you about the nature of matter.

I The allowed energies of a simple atom are 0.00eV,4.00eV,and6.00eV.

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c. What wavelengths appear in the atom's absorption spectrum?

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Find the radius of the electronโ€™s orbit, the electronโ€™s speed, and the energy of the atom for the first three stationary states ofHe+.

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