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Apps Physical Therapy Ce. E graduate colleges college sheeeiiittttttt Physics 102 Fall 2019 Chapter 29 Homework Toblem 29.17 The allowed energies of a simple atom are 0.0 eV.3.0 eV and 4.0 V. An electron traveling at a speed of 1.3x10 m/s collisionally excites the atom. What is the minimum speed the electron could have after the collision? Express your answer with the appropriate units. TAO? v- 1.2.10° Submit Previous Answers Request Answer X Incorrect: Try Again; 7 attempts remaining Part B What is the maximum speed the electron could have after the collision? Express your answer with the appropriate units HAO ? Valute Units Submit Request Answer O Type here to search

Answer 1

Given: Ve= 1:3x160mis Elc ooer, E2=3.0 en E3-4.oen Energy of lincident-electron : to= 1 uur to= 1x (9.1x10 3 x ( 1.3x106) 2. = 7.689 5 X 10-19 J I to ai 7.6,895 8 15.19 et - 4,8 V 16 X 10-19 speed of ē will be nininom if the atom est El is excited to E3 their min. energy of è after collision DE Eon (E3-E 1) = 4,8-(4-0) 20,8 év = 0,8X116 X 10'9 - 1:28x169 min. speed of é: Vmin 12 DE TVmin [2x11 28 41019 m = 0.538 100 mis e 9.12.15 31 = 5:3x105 uns Any speed of é will be maximum if the atom at Ez is excited to E3 then mad. enigy of ē after collision; AE = Eor(E3-62) At = 4.8 - (4.0 - 3,0) = 3.8er DE 23 18 X 1.6x15 195 = 6:08x10-19 5 max. speed of e Vad 20€ sm 2x6.08X 10-19 Vmax = 1.15x10 uns