# YOUR NAME Sample Final Physics 1404 (Dr. Huang)), Correct answers are underlined.

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1 YOUR NAME Sample Final Physics 1404 (Dr. Huang)), Correct answers are underlined. Useful constants: e= C, m e = kg, m p = kg, ε 0 = C 2 /N m 2, c= m/s k e = N m 2 /C 2, µ 0 =4π 10-7 Wb/A m, h= J s, 1au= kg. =========================================================================== *** Problems 1-32 carry equal credit of 5 points *** Problem 1,2,3 Two point charges are arranged as shown in the figure. y What is the magnitude of electric field at the origin? a) N/C b) N/C c) N/C d) N/C e) N/C f) N/C q 2 =-2µC q 1 =+5µC 3m 2m 0 x What is the angle between the electric field and the x-axis at the origin? a) 153 b) 289 c) 67 d) 127 e) 260 f) 321 E θ x What is the electric potential at the origin? a) Volts b) Volts c) Volts d) Volts e) Volts f) None of above Problem 4,5 Two parallel metal plates are separated by 2 mm. A 120 V potential difference is maintained between those plates. If an electron is released from the negative plate, What is the electrostatic force on the electron? a) N b) N c) N d) N e) N 1 of 8

2 What is the speed of the electron when it reaches the positive plate? a) m/s b) m/s c) m/s d) m/s e) m/s f) m/s Problem 6,7 When an air-filled parallel-plate capacitor is connected to a 15 V source, it contains 90 µc of charge. After disconnecting the capacitor from the source, the distance between two parallel plates is now reduced to half. What is its new capacitance? a) 4 µf b) 10 µf c) 6 µf d) 1 µf e) 3 µf f) 12 µf What happen to the potential difference between two plates? a) Doubled b) Halved c) No change d) No potential difference e) Quadrupled Problem 8,9 In the circuit on the right, What is the equivalent resistance of the entire network? a) 10 Ω b) 10.6 Ω c) 12 Ω d) 19 Ω e) 16 Ω 24V 8Ω 2Ω 6Ω 3Ω What is the power dissipated on the 8Ω resistor? a) 32 W b) 40 W c) 8.0 W d) 16 W e) 20 W f) 48 W g) None of above 2 of 8

3 Problem 10 Two parallel wires carry currents of 40 and 80 A, respectively, in opposite directions. The wires are separated by 1.0 cm. What is the force on a 0.80 m long segment of the wire carrying the larger current? a) N b) N c) 1.85 N d) N e) N f) None of above Problem 11,12 A circular coil with 500 turns and radius 5.0 cm is placed in a spatially uniform magnetic field of 0.10 T. The field is parallel to the axis of the coil. What is the magnetic flux through the coil? a) Wb b) Wb c) Wb d) Wb e) Wb In order to have an induced emf in the coil of 100 V, the time during which this field must be linearly reduced to zero is a) ms b) ms c) ms d) 3.9 ms e) 1.87 ms f) None of the above Problem 13,14 A closed rectangular conducting loop is moving away from a long straight wire carrying current I. What is the direction of the induced current in the loop? I a) Clockwise b) Counterclockwise c) No induced current What is the direction of net magnetic force on the loop? a) Up b) Down c) Left d) Into the paper e) Out of Paper f) None of above v 3 of 8

4 Problem 15 The magnitude of the Poynting vector for solar radiation at the top of the earth s atmosphere is 1350 W/m 2. The distance earth-sun is 150 million kilometers. Calculate the total radiative output from the sun. a) Watts b) Watts c) Watts d) Watts e) Watts f) None of above Problem 16 Draw ray diagram to find the image of the object O formed by the thin converging lens. Is the image real or virtual? O F 1 F 2 lens Problem 17,18 A 631 nm laser beam (measured in air) is introduced into an optical fiber with an index of refraction of 1.52, which is submerged in water (n w = 1.33). The critical angle for total internal reflection under water is a) 41 b) 49 c) 61 d) 56 e) 74 What is the wavelength of the light in the optical fiber? a) 474 nm b) 839 nm c) 959 nm d) 631 nm e) 415 nm f) 779 nm 4 of 8

5 Problem 19 The magnification produced by a converging lens is found to be -3.5 for an object placed m from the lens. What is the focal length of the lens? a) 0.35 m b) 0.31 m c) 0.26 m d) 0.22m e) 0.19 m f) 0.14 m Problem 20 A camera lens is made of a glass with index of refraction of A 100 nm thick antireflection coating made of MgF 2 (n = 1.38) is deposited on the surface of the lens. Calculate the wavelength (in air) of the visible light for which this coating works best. a) 552 nm b) 600 nm c) 400 nm d) 276 nm e) 345 nm f) 476 nm Problem 21 A circular radar antenna on a ship has a diameter of 2.8 m and radiates at a frequency of 12x10 9 Hz. Two small boats are located 11 km away from the ship. How close could the boats be and still be detected as two objects? a) 112 m b) 76 m c) 98 m d) 120 m e) 89 m f) 32 m Problem 22 A spaceship travels with a speed of 0.441c as it passes by the Earth, as shown in the figure. The pilot of the spaceship measures the length of the moving ship as 42.8 m. Determine its length as measured by a person on the Earth. a) 39.6 m b) 41.1 m c) 38.4 m d) 45.8 m e) 32.1 m f) 25.9 m 5 of 8

6 Problem 23 Calculate the total energy of a proton if it is accelerated to a speed of 0.41c. a) J b) J c) 3.22x10-10 J d) 1.65x10-10 J e) 1.11x10-10 J f) 4.91x10-10 J Problem 24 A proton has a mass that is 2.5 times of its rest mass. What is its speed? a) 0.84c b) 0.89c c) 0.92c d) 0.75c e) 0.95c f) 0.97c Problem 25 A metal has a work function of 3.5 ev. What is the cut-off wavelength of the illuminating light, above which no photoelectron is emitted from the surface? a) 239 nm b) 299 nm c) 355 nm d) 412 nm e) 576 nm f) 642 nm Problem26 What is the minimum energy of a photon that can produce an electron-positron pair? a) 1.02 MeV b) 2.33 MeV c) 1.69 MeV d) 0.78 MeV e) 2.77 MeV f) 3.92 MeV Problem 27 The uncertainty in the position of a proton is nm. What is the uncertainty in its speed? a) 1192 m/s b) 600 m/s c) 972 m/s d) 312 m/s e) 882 m/s f) 789 m/s 6 of 8

7 Problem 28 Determine the wavelength of light emitted when a hydrogen atom makes a transition from the n = 6 to the n = 3 energy level according to the Bohr mode. The Rydberg constant R = x10 7 m -1. a) 388 nm b) 723 nm c) 987 nm d) 755 nm e) 678 nm f) 1094 nm Problem 29 Which of the following electron configurations is a possible ground state? a) 1s 2 2s 1 2p 5 3s 3 b) 1s 2 2s 2 2p 6 2d 1 c) 1s 2 2s 2 2p 6 3s 2 d) 1s 2 2s 2 2p 7 3s 2 e) 1s 2 1d 2 2s 2 2p 7 3s 2 f) None of these is possible Problem 30 What is the approximate radius of a Cu nucleus? a) 3.3x10-15 m b) 1.9x10-15 m c) 4.8x10-15 m d) 3.6x10-15 m e) 2.7x10-15 m Problem 31 Complete the following nuclear reaction: K H Ca a) p b) n c) 1 2 H 3 H d) 1 e) β - Problem 32 The mass of tritium ( 1 3 T ) is au. Based on m H = au and m n = au, calculate its binding energy per nucleon. (1 au = MeV/c 2 ) a) MeV b) 2.83 MeV c) 3.33 MeV d) 3.78 MeV e) 1.55 MeV 7 of 8

8 Problem 33-52: (2 points each) Fill in a T/F answer for each statement below: 33. [ ] The force on a negative charge is in the opposite direction of the electric field. 34. [ ] Electric field vector is perpendicular to the electric field line at each point. 35. [ ] A 10 µf capacitor can store 50 µc of charge if the potential difference between the two conducting plates is 5 volts. 36. [ ] All materials follow the Ohm s law. 37. [ ] The equivalent capacitance of a series combination is always less than any individual capacitance in the combination. 38. [ ] If a current carrying wire does not experience any magnetic force, the magnetic field must be zero in that area. 39. [ ] Parallel conductors carrying currents in the same direction attract each other. 40. [ ] A large, steady magnetic flux through a circuit induces a large emf. 41. [ ] Lenz's law states that the induced current and induced emf in a conductor are in such a direction as to enhance the magnetic flux change that produced them. 42. [ ] The electric and magnetic components of a plane EM wave are always perpendicular to each other. 43. [ ] In Young s double-slit experiment, the condition for constructive interference is that the path difference of two waves must be either zero or some integer multiple of the wavelength. 44. [ ] If the incident angle of a light equals Brwester's angle, the reflected beam would be partially polarized. 45. [ ] To improve the resolution of a lens, one can either increase the diameter of the lens or decrease the frequency of the light. 46. [ ] The principle of the constancy of the speed of light states that the speed of light in empty space has the same value in all inertial reference frames, independent of the speed of the source or observer. 47. [ ] In a pair production, a photon disappears and an electron pair is created. 48. [ ] If an electron jumps from the ground state to an excited state, it absorbs a photon whose energy equals (E e -E g ). 49. [ ] Heisenberg uncertainty principle states that both the energy and momentum of an object cannot be measured precisely at the same time. 50. [ ] For each orbital quantum number l, the magnetic quantum number can take 2(l+1) possible values. 51. [ ] Pauli exclusion principle states that no two electrons in an atom can occupy the same quantum state. 52. [ ] The four known type of forces are strong nuclear force, weak nuclear force, gravitational force and electromagnetic forces. 8 of 8

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