Concept explainers
(a)
Speed of electrons when they hit the screen.
(a)
Answer to Problem 20P
The speed of the electrons is
Explanation of Solution
Write the equation of motion.
Here
Write the expression for acceleration from the balancing equation of forces
Here
Substitute
Conclusion
Substitute
The speed of the electrons is
(b)
Time taken to travel the length of tube.
(b)
Answer to Problem 20P
The time taken to travel the length of tube is
Explanation of Solution
Write the equation of motion to find the displacement change.
Substitute (II) in (IV)
Substitute
Write the equation for
Substitute (III) in (VII)
Write the equation for total time interval
Substitute (VI) and (VIII) in (IX)
Conclusion
Substitute
The time taken to travel the length of tube is
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