Concept explainers
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 subcellular 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 xy plane with initial velocity
(a)
The electron position after travelling a horizontal distance of
Answer to Problem 4.8P
The position of the electron is
Explanation of Solution
The x component of velocity is
Write the equation for the x component of the motion
Here,
Substitute
Write the equation for the y component of the motion
Here,
Conclusion:
Substitute
Therefore, the position of the electron is
(b)
The electron velocity after travelling a horizontal distance of
Answer to Problem 4.8P
The velocity of the electron is
Explanation of Solution
Write the formula to calculate velocity
Conclusion:
Substitute
Therefore, the velocity of the electron is
(c)
The electron speed after travelling a horizontal distance of
Answer to Problem 4.8P
The speed of the electron is
Explanation of Solution
Write the formula to calculate speed
Substitute
Conclusion:
Therefore, the speed of the electron is
(d)
The direction of motion of the electron.
Answer to Problem 4.8P
The direction of travel of the electron is
Explanation of Solution
Write the formula to calculate direction of travel
Conclusion:
Substitute
Therefore, the direction of travel of the electron is
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Chapter 4 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
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