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practice1 - Richard Hallstein PHY232/232C Fall 2010 1...

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Unformatted text preview: Richard Hallstein- PHY232/232C Fall 2010 1 Practice 1 Hallstein, Richard Keep this exam CLOSED until advised by the instructor. Fill out the bubble sheet: last name, first initial and student number. 60 minute long closed book exam. A two-sided 8.5 by 11 handwritten help sheet is allowed. When done, hand in your bubble sheet and your exam . Possibly useful constants: • k e = 8.99 × 10 9 Nm 2 /C 2 • ǫ = 8.85 × 10-12 As/(Vm) • μ = 4 π × 10-7 Vs/(Am) • c = 3.00 × 10 8 m/s • g = 9.81 m/s 2 • G = 6.67 × 10-11 Nm 2 /kg 2 • e = 1.60 × 10-19 C • m e = 9.11 × 10-31 kg • m e c 2 = 0.511 MeV • h = 6.63 × 10-34 Js • h = 4.14 × 10-15 eVs • hc = 1240 eVnm • σ = 5.67 × 10-8 W/(m 2 K 4 ) • Wien’s constant = 2.898 × 10-3 Km • R H = 1.097 × 10 7 1/m • E = 13.6 eV • a = 0.529 Angstrom • 1 eV = 1.60 × 10-19 J • 1 AMU (1 u) = 931.494 MeV/c 2 = 1.67 × 10-27 kg • × Field directly into page. • • Field directly out of page • 1 pico (p) = 10-12 [email protected] Richard Hallstein- PHY232/232C Fall 2010 3 Practice 1 4 pt An ion has 103 neutrons, 78 protons and 75 electrons. What is the net charge in Coulombs on the ion? 1. A circlecopyrt 1 . 6 × 10- 19 B circlecopyrt 2 . × 10- 19 C circlecopyrt 2 . 5 × 10- 19 D circlecopyrt 3 . 1 × 10- 19 E circlecopyrt 3 . 8 × 10- 19 F circlecopyrt 4 . 8 × 10- 19 G circlecopyrt 6 . × 10- 19 H circlecopyrt 7 . 5 × 10- 19 3 pt Two spherical objects with a mass of 8.01 kg each are placed at a distance of 3.36 m apart. How many electrons need to leave each object so that the net force between them becomes zero? 2. A circlecopyrt 2 . 30 × 10 9 B circlecopyrt 2 . 69 × 10 9 C circlecopyrt 3 . 15 × 10 9 D circlecopyrt 3 . 68 × 10 9 E circlecopyrt 4 . 31 × 10 9 F circlecopyrt 5 . 04 × 10 9 G circlecopyrt 5 . 90 × 10 9 H circlecopyrt 6 . 90 × 10 9 3 pt Consider the system of four charges in the diagram below. Each charge is 39 cm from the origin....
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practice1 - Richard Hallstein PHY232/232C Fall 2010 1...

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