23. 24. 25. 26. 27. 28. What is the speed of an electron that has 13.3 eV of kinetic energy? (answer: 2.16x106 m/s) An alpha particle traveling 7.15x104 m/s is accelerated (speeds up) through a potential difference with a magnitude of 15.3 V. What is the final speed ofthe alpha particle? (8.11x104 m/s) A proton is accelerated by a potential difference of 7.20 x 102 V. What is the change in kinetic energy of the proton? [1.15 x 10'16 J] An alpha particle gains 1.50 x 1015] of kinetic energy. Through what potential difference was it accelerated? [4.69 x 103 V] The electric field strength between two parallel plates is 9.3 x 102 V/m when the plates are 7.0 cm apart. What would the electric field strength he ifthe plates were 5.0 cm apart? [1.3 x 103 V/m] An electron is released from rest adjacent to the negative plate in a parallel plate apparatus. A potential difference of 500 V is maintained between the plates, and they are in a vacuum. With what speed does the electron collide with the positive plate? (1.3 x 107 m/s) 29. An electron with a velocity of 5.0 x 106 m/s is injected into a parallel plate apparatus through a hole in the positive plate. It moves across the vacuum between the plates, colliding with the negative plate at 1.0 x 10" m/s. What is the potential difference between the plates? (68 V) lnmal path Lil- [ _ hcam of electrons U [MU in (all I) '.' l:ij 30. Assuming that electrons enter the following parallel plate with a horizontal velocity of 3.20 x 106 m/ 5, how far will the electrons travel horizontally before they crash into the positive plate? [5.58 x 10'2 m] 31. A proton is placed in an electric field between two parallel plates. If the plates are 6.0 cm apart and have a potential difference between them of 7.5 x 101 V, how much work is done against the electric field when the proton is moved 3.0 cm parallel to the plates? [0] 32. In the previous question, how much work would be done against the electric field ifthe proton was moved 3.0 cm perpendicular to the plates? [6.0 x 1018 J]