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Allen Physics Second Semester Exam In the space to the left, write the letter of the answer to each question ____ 1. Bits of paper stick to a plastic comb that has been rubbed because of ____ 2. An important difference between insulators and conductors is that in conductors ____ 3. When electrons are transferred from one object to another, positive and negative charges are ____ 4. The force that charge q1 exerts on q2 is opposite and _______ the force that charge q2 exerts on q1. ___ 5. An electric field is equal to ___ 6. The strength of the force on a charge in an electric field depends on ___ 7. In a uniform electric field, the potential difference between two points is found using the equation ___ 8. Touching an object to the Earth to eliminate excess electrical charge is ___ 9. The charges on a hollow conductor are found ___ 10. A capacitor is ___11. If there are four electrical devices connected in series, then the number of paths is equal to ___12. If three resistors are connected in parallel, there are ___________ current paths in the circuit. ___13. An ammeter is connected in _______ and a voltmeter is connected in _______. ___14. An ampere is a ___15. Compared to thin wires, electrical resistance in thick wires is ___16. Electrical resistance is measured in ___17. The current flowing through a circuit is always increases by ___18. The units for a volt are ___19. The units for an Ampere are ___20. When resistors are placed in parallel with each other, the total resistance is ___21. As more lamps are placed in a series circuit, the overall current ___22. Electrical elements in our home are connected in ____23. Energy is measured in ____24. A positive charge of 3.6 x 10-5 C and a negative charge of – 2.4 x 10-5 C are 0.034m apart. What is the force between the two particles? ____25. A 15 volt battery is connected to a flashlight. If 3 coulombs of electricity pass through the wire from one terminal to the other, how much energy is available for the light? ____26. What is the current that passes through a 3 resistor connected to a 24 V power supply? ___27. A 36 resistor is connected to a 120 V power supply. What is the current? ____28. A 8and a 9 resistor are connected in parallel across a 50 V power source. What is the equivalent resistance in the circuit? ____29. A 8and a 9 resistor are connected in parallel across a 50 V power source. What is the total current in the circuit? ___ 30. A 15 and a 36 resistors are attached in series to a 50V power supply. What is the equivalent resistance? A 15 and a 36 resistors are attached in series to a 50V power supply. What is the total current? Allen ___32. As an approaching ambulance passes an unmoving observer, what happens to the apparent pitch of the sound emitted by the ambulance siren, as heard by the observer? __33. The speed of any mechanical wave depends on _____. ___34. Echoes demonstrate which behavior of sound waves? ___35. Sound is an example of what kind of wave? ___36. The time interval during which wave motion repeats is the _____. Omit question 37 to 59. 37. A convex mirror with a focal length of –20.0 cm forms an image 12 cm behind the surface. Where is the object as measured from the surface? ____ 38. Which best describes the image of a concave mirror when the object’s distance from the mirror is less than the focal-point distance? ____39. When a straight line is drawn perpendicular to a flat mirror at the point where an incoming ray strikes the mirror’s surface, the angles of incidence and reflection are measured from the normal and ____ 40. If a light ray strikes a flat mirror at an angle of 27° from the normal, the reflected ray will be ____ 41. If you stand 3.0 m in front of a flat mirror, how far away from you would your image be in the mirror? ____ 42. A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object? ____43. A concave mirror forms a real image at 25 cm from the mirror surface along the principal axis. If the corresponding object is at a 10.0 cm distance, what is the mirror’s focal length? ____ 44. Which portion of the electromagnetic spectrum is used in a microscope? ____ 45 If you know the wavelength of any form of electromagnetic radiation, you can determine its frequency because ____46. The image of an object in a flat mirror is always ____47. When two parallel mirrors are placed so that their reflective sides face one another, ____ images form. This is because the image in one mirror becomes the ____ for the other mirror. ____ 48. When the reflection of an object is seen in a flat mirror, the distance from the mirror to the image depends on ____ 49. If a virtual image is formed 10.0 cm along the principal axis from a convex mirror with a focal length of –15.0 cm, what is the object’s distance from the mirror? ____ 50. Which portion of the electromagnetic spectrum is used in a television? ____ 51. Which portion of the electromagnetic spectrum is used in aircraft navigation? ____ 52. Which portion of the electromagnetic spectrum is used to identify fluorescent minerals? ____ 53. What is the wavelength of microwaves of 3.0 × 109 Hz frequency? ____ 54. What is the frequency of an electromagnetic wave with a wavelength of 1.0 × 105 m? ____ 55. Yellow-green light has wavelength of 560 m. What is its frequency? ____ 56. In a vacuum, electromagnetic radiation of short wavelengths. ____ 57. When red light is compared with violet light, ____ 58. The farther light is from a source, ____ 59. If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is ____ 60. Snow reflects almost all of the light incident upon it. However, a single beam of light is not reflected in the form of parallel rays. This is an example of ____ reflection off of a ____ surface. ____ 61. A highly polished finish on a new car provides a ____ surface for ____ reflection. ____ 62. Which of the following is the time it takes to complete a cycle of motion? ____ 63 Which of the following is the number of cycles or vibrations per unit of time? ____ 64. How are frequency and period related in simple harmonic motion? ____ 65. An amusement park ride has a frequency of 0.05 Hz. What is the ride’s period? Allen ____ 66. An amusement park ride swings back and forth once every 40.0 s. What is the ride’s frequency? ____ 67. One end of a taut rope is fixed to a post. What type of wave is demonstrated if the free end is quickly raised and lowered? ____ 68. In the waveform of the longitudinal wave shown above, the compressed regions correspond to ____ 69. In the waveform of the longitudinal wave shown above, the stretched regions correspond to ____ 70. A periodic wave has a wavelength of 0.50 m and a speed of 20 m/s. What is the wave frequency? ____ 71. A musical tone sounded on a piano has a frequency of 410 Hz and a wavelength of 0.80 m. What is the speed of the sound wave? ____ 72. A radio wave has a speed of 3.00 × 108 m/s and a frequency of 107 MHz. What is the wavelength? ____ 73. Bats can detect small objects, such as insects, that are approximately the size of one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 330 m/s, what is the size of the smallest insect that the bat can detect? ____ 74. Waves propagate along a stretched string at a speed of 8.0 m/s. The end of the string vibrates up and down once every 1.5 s. What is the wavelength of the waves traveling along the string? ____ 75. What happens to the energy carried in a given time interval by a mechanical wave when the wave’s amplitude is doubled? ____76. What happens to the energy carried in a given time interval by a mechanical wave when the wave’s amplitude is halved?. ____ 77. Two waves can occupy the same space at the same time because waves ____ 78. The superposition of mechanical waves can be observed in the movement of ____ 79. Which of the following types of interference will occur in the figure above?