Question
In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude $4.0 \times 10^{5} \mathrm{N} / \mathrm{C}$ during the first $5.0 \mathrm{cm}$ of the tube's length; then they move at essentially constant velocity another $45 \mathrm{cm}$ before hitting the screen. (a) Find the speed of the electrons when they hit the screen. (b) How long does it take them to travel the length of the tube?
Step 1
The force on the electrons is given by $F = qE$, where $q$ is the charge of the electron and $E$ is the electric field. Therefore, the acceleration of the electrons is given by $a = \frac{qE}{m}$. Show more…
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