Easy Physics 2 quiz

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Name _________________________________ I.D. Number _______________________ Unit 2 Evaluation Physics 2 (SCIH 036 058) This evaluation will cover the lessons in this unit. It is open book, meaning you can use your textbook, syllabus, and other course materials. To submit the evaluation, follow the directions provided. When you feel you are adequately prepared, complete this Unit Evaluation. It is important that you do your own work. If you have difficulty with particular sections, you may use your textbook and course materials for help in answering the questions. You may also use your calculator on this evaluation. After you have completed this evaluation, you will submit it for grading. Multiple Choice Choose the answer that best completes the statement or answers the question. 1. What is a hertz? a. the distance between successive identical parts of a wave b. the number of vibrations per unit time c. the distance from a midpoint to a crest d. a unit of frequency defined as once cycle per second ____ 2. All physical waves are created by a. a change in temperature. b. an object that is moving. c. a change in pressure. d. an object that is vibrating. ____ 3. Which of the following best describes a transverse wave? a. The medium does not vibrate. b. The medium vibrates at right angles to the direction the wave travels. c. The medium vibrates in the same direction the wave travels. d. No medium is required. Unit 2 Evaluation SCIH 036 ____ 4. Which waves are examples of a longitudinal wave? a. waves in the strings of instruments b. radio waves c. light waves d. sound waves ____ 5. What kind of wave (as illustrated in Figure 25.9 on page 497 of your textbook) transfers energy from left to right? a. both transverse and longitudinal b. transverse c. longitudinal d. neither longitudinal nor transverse ____ 6. What does it mean to be “out of phase” a. when crests overlap troughs and effects are reduced b. when crests of one wave overlap the crests of another wave c. when crests overlap and effects add together d. when crests and troughs overlap to produce zero amplitude ____ 7. Two fire-trucks with sirens on speed toward and away from an observer as shown in Figure 25.17 on page 503 of your textbook. Describe the effect produced by the truck on the left in terms of frequency. a. Frequency is increasing, resulting in higher pitch. b. Frequency is decreasing, resulting in higher pitch. c. Frequency is increasing, resulting in lower pitch. d. Frequency is decreasing, resulting in lower pitch. e. Frequency does not change but wavelength does. ____ 8. What causes a bow wave? a. Bow waves are only caused by the front of a boat cutting through water. b. Bow waves are created when any wave source moves faster than the wave it produces. c. Bow waves are created when a sonic boom creates a moving region of high pressure. d. Bow waves are only caused by objects approaching the speed of sound. Unit 2 Evaluation SCIH 036 ____ 9. You are standing on a pier watching waves go by. A wave passes you every 5 seconds and you note that the crests are separated by 12 m. How fast are the waves traveling? a. 0.24 m/s b. 2.4 m/s c. 24 m/s d. 240 m/s ____ 10. What vibrates when you speak? a. your throat b. your mouth c. your vocal cords ____ 11. Suppose a friend is far away and tapping on a metal fence. What can you say about the sounds created? a. The sound is softer and travels slower in the metal than in the air. b. The sound is louder but travels slower in the metal than in the air. c. The sound is softer but travels faster in the metal than in the air. d. The sound is louder and travels faster in the metal than in the air. ____ 12. According to the following table, determine the source of sound that is 100 times as intense as the normal sound in a library. Source of Sound Level in dB jet engine at 30m 140 old subway train 100 average factory 90 normal speech 60 library 40 a. jet engine at 30m b. old subway train c. average factory d. normal speech Unit 2 Evaluation SCIH 036 ____ 13. According to Figure 26.16 in your textbook, which of the following explains how beats are formed? a. One sound source is regularly turned on and off. b. Two sound sources with the same frequency are on opposite sides of the listener. c. One sound source produces areas of high and low density that are perceived as being loud and quiet. d. Two sound sources with slightly different frequencies interfere with each other. ____ 14. What does your friend mean when she says “light is the only thing you see”? a. Your friend is incorrect because light is not actually visible. b. It is just a saying to highlight the important role of light. c. A green plant reflects green light and so without light the plant would not be visible. ____ 15. List the types of waves in the EM spectrum in order from longest wavelength (at the top) to shortest wavelength (at the bottom). a. radio, micro, IR, visible, UV, X-rays, Gamma-rays b. radio, micro, UV, visible, IR, X-rays, Gamma-rays c. Gamma-rays, X-rays, UV, visible, IR, micro, radio d. Gamma-rays, X-rays, IR, visible, UV, micro, radio ____ 16. What is the basic difference between transparent and opaque materials? a. Light passes through transparent materials but is absorbed or reflected by opaque materials. b. Light passes through opaque materials but is absorbed or reflected by transparent materials. c. Transparent materials are “clear” while opaque materials let light through but not color. d. Opaque materials are “clear” while transparent materials let light through but not color. ____ 17. The Doppler effect is a. a change in sound frequency due only to the motion of the source of the sound. b. a change in light frequency due only to the motion of the source of the receiver. c. a change in sound or light frequency due only to the motion of the source of the sound. d. a change in either sound or light frequency due to the motion of either the source or receiver. Unit 2 Evaluation SCIH 036 ____ 18. A satellite TV company broadcasts its signals from its earthbound station to a satellite in orbit 36,000km away, and from there back to Earth’s surface. How much time does it take for the signal to get from the station to the customer? a. 0.12 seconds b. 0.24 seconds c. 1.2 seconds d. 2.4 seconds ____ 19. What color will an opaque object appear? a. the color it reflects b. the color of the light that shines on it c. the color it absorbs d. the color of white light ____ 20. What happens to the sunlight in Figure 28.6 in your textbook as it passes through the glass? a. Blue light is reflected. b. All the colors are reflected except blue, which is transmitted. c. Blue light is absorbed. d. All the colors are absorbed except blue, which is transmitted. ____ 21. Use Figure 28.7 in your textbook to determine if the brightness of sunlight is directly proportional to frequency. a. Yes, the brightness of sunlight is directly proportional to frequency. b. No, the brightness of sunlight is not directly proportional to frequency. ____ 22. What is the brightest portion of the spectrum of sunlight? a. short wavelength, blue-violet light b. long wavelength, red light c. middle wavelength, yellow-green light ____ 23. What is a complementary color? a. the color that is produced when one color is subtracted from white light b. one of two colors that go well together c. the color that is produced when two primary colors are added Unit 2 Evaluation SCIH 036 ____ 24. Your friend claims that mixing colored paints gives the same results as mixing different colors of light. Do you agree or disagree? a. agree b. disagree Matching Match the scientist with the idea about the nature of light. Some ideas may be used more than once. ____ 25. Einstein a. Light is a wave. ____ 26. Empedocles b. Light consists of tiny particles. ____ 27. Euclid ____ 28. Huygens c. Vision results from streamers or filaments emitted by the eye making contact with an object. ____ 29. Plato ____ 30. Socrates Match the following terms with their definitions. ____ 31. A phenomenon that occurs when the frequency of a vibration forced on an object matches the object’s natural frequency. a. natural frequency b. resonance ____ 32. A vibration that occurs when an object is made to vibrate by another vibrating object nearby. c. rarefaction ____ 33. The frequency at which an object vibrates when it is disturbed. e. forced vibration d. compression ____ 34. A pulse of compressed air that travels to create sound. ____ 35. A pulse of low-pressure air that travels to create sound. Carefully check your answers on this evaluation and make any corrections you feel are necessary. When you are satisfied that you have answered the questions to the best of your ability, transfer your answers to an answer sheet. Please refer to the information sheet that came with your course materials. Unit 2 Evaluation SCIH 036
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