Question
Describe and give the results of an electron microscopy experiment that shows the same thing as the experiment in the preceding question.
Step 1
The goal is to investigate the structural characteristics of a specific sample, similar to the previous experiment, which may have focused on cellular components or material properties. Show more…
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REFLECT AND APPLY Would you expect electron microscopy to give detailed information about ribosomal structure? Hint: Look at Figure 12.18
It is not possible to see very small objects, such as viruses, using an ordinary light microscope. An electron microscope, however, can view such objects using an electron beam instead of a light beam. Electron microscopy has proved invaluable for investigations of viruses, cell membranes and sub-cellular structures, bacterial surfaces, visual receptors, chloroplasts, and the contractile properties of muscles. The "lenses" of an electron microscope consist of electric and magnetic fields that control the electron beam. As an example of the manipulation of an electron beam, consider an electron traveling away from the origin along the $x$ axis in the $x y$ plane with initial velocity $\overrightarrow{\mathbf{v}}_{i}=v_{i} \hat{\mathbf{i}} .$ As it passes through the region $x=0$ to $x=d$, the electron experiences acceleration $\overrightarrow{\mathbf{a}}=a_{x} \hat{\mathbf{i}}+a_{y} \hat{\mathbf{j}},$ where $a_{x}$ and $a_{y}$ are constants. For the case $v_{i}=1.80 \times 10^{7} \mathrm{m} / \mathrm{s}$ $a_{x}=8.00 \times 10^{14} \mathrm{m} / \mathrm{s}^{2},$ and $a_{y}=1.60 \times 10^{15} \mathrm{m} / \mathrm{s}^{2},$ determineat $x=d=0.0100 \mathrm{m}$ (a) the position of the electron, (b) the velocity of the electron, (c) the speed of the electron, and (d) the direction of travel of the electron (i.e., the angle between its velocity and the $x$ axis ).
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