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4.1
Direct measurements of the distribution of velocities in a
molecular beam have been made by a number of methods. Two
different arrangements are shown in Figure 4.1. Give a brief
comparison (similarities and differences) between the two
arrangements on how the distribution of molecules are
observed and measured.
CHO
Oven
Slit
Oven
Screen
Vertical
(Zartman and Ko arrangement)
Simpson, and Stern arrangement)
Figure 4.1
Slit
Screen
(Estermann,

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A. It appears that there should be a bright fringe at the location of point D. Why isn’tthere? Explain The previous figure is also labeled with points A and B which are at the locations of maximaand points C and D which are at the locations of minimum For Questions b and c below,you will need to discuss whether each of those minima/maxima stays at the same location,moves to the left or moves to the right and then explain your answers for each B. The slit width is slightly decreased C. The slit separation is slightly decreased.
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