Physics1410_Chapter_15_practice_questions (1)

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Chapter 015 Making Waves 1. Electromagnetic waves are generally A. transverse waves. B. longitudinal waves. C. a 50/50 combination of transverse and longitudinal waves. D. standing waves. 2. The period and the frequency of a sound wave are A. reciprocals of each other. B. independent of each other. C. multiples of each other—period is 2p times the frequency. D. none of these. 3. The Doppler effect refers to changes in a sound wave's A. frequency caused by a change in speed of sound. B . frequency caused by motion of a source or receiver. C. amplitude caused by a change in speed of sound. D. amplitude caused by motion of a source or receiver. 4. If the speed of sound is 1100 feet per second and a tuning fork oscillates at 440 cycles per second, what is the wavelength l of the sound produced? A. 11 feet. B. 4.4 feet. C. 0.4 foot. D. 2.5 feet. 5. On a day when the speed of sound in air is 340 m/s, a lightning bolt is observed and the resultant thunderclap is heard 2 seconds afterwards. About how far away was the lightning bolt? A. 170 m.
B. 680 m. C. 1020 m. D. 1700 m.
6. You hear a musician playing a series of notes of increasing frequency. As the frequency increases, the wave speed A. decrease s. B. stays the same. C. increase s. 7. Suppose an audible sound wave were being produced at a frequency of 800 cycles per second. If the frequency were doubled, the sound would become A. higher in pitch. B. loude r. C. lower in pitch. D. softe r. 8. Jim the meteorologist has predicted fair weather all day but sees flashes of lightning followed by rolls of thunder. To calculate the distance to the lightning bolt, Jim should measure the time between the instant he first sees a lightning flash and the A. instant the lightning flash is over. B . instant he hears the beginning of the next thunder roll. C. instant he hears the middle of the next thunder roll. D. instant he hears the end of the next thunder roll. E. instant he sees the beginning of the next lightning flash. 9. As a wave passes from one medium into another, it often happens that its speed increases with no change in frequency. Under these circumstances, the wavelength A. decrease s. B. stays the same. C. increase s. 10. The pitch of a sound is determined primarily by its A. frequenc y.
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B. duratio n. C. spee d. D. amplitud e.
11. Which of these lists is in order of increasing wavelength? A. First harmonic, second harmonic, third harmonic. B. Second harmonic, third harmonic, fourth harmonic. C. First harmonic, second harmonic, fundamental. D. Third harmonic, second harmonic, first harmonic. 12. The principle of superposition tells us that, if two waves cross paths, A. the frequency is the sum of the individual frequencies. B. the amplitude is the sum of the individual amplitudes. C. the wavelength is the sum of the individual wavelengths. D. the speed is the speed of the faster wave. 13. When a wave reflects from a stationary boundary, A. the frequency decreases. B. the frequency is unchanged. C. the frequency increases. 14. Suppose the velocity of waves on a particular rope under a tension of 10 N is 12 m/s. If the tension is decreased to 2.5 N what will be the new velocity of waves on the rope? A. 48 m/s. B. 24 m/s. C. 18 m/s. D. 12 m/s. E. 6 m/s. 15. Waves on a particular string travel with a velocity of 10 m/s. A high- speed photograph shows that successive peaks are 0.50 m apart along the string. The frequency of the waves is: A. 5 Hz. B. 10 Hz.
C. 15 Hz. D. 20 Hz. E. 25 Hz.
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16. On a day when the speed of sound in air is 340 m/s, what will be the wavelength of sound of frequency 510 Hz? A. 510 m B. 3.0 m C. 1.5 m D. 0.67 m E. 0.33 m 17. A string is held taut between two supports 4.0 m apart. The two longest possible wavelengths for standing waves are A. 4 m and 2 m. B. 6 m and 3 m. C. 8 m and 4 m. D. 16 m and 5.3 m. 18. The speed of electromagnetic waves in air is 3.0 × 10 8 m/s. What is the wavelength of FM radio waves having a frequency of 1.0 × 10 8 Hz? A. 0.333 m B. 1.0 m C. 3.0 m D. 6.0 m E. 10 m 19. A fast train approaches a car waiting at a grade crossing and sounds its horn. A person in the car will notice that, compared to what it would be if the train were at rest, the A. wavelength appears to be longer. B. frequency appears to be higher. C. frequency appears to be lower. D. wavelength appears to be the same.
20. Human hearing is most sensitive around 2500 Hz. If the speed of sound is 340 m/s, what is the wavelength of this sound? A. 0.14 m B. 7.4 m C. 340 m D. 2160 m 21. Blowing gently across the top of a soda pop bottle gives you a musical note at a certain fundamental frequency. This is most similar to A. making a guitar string resonate at its fundamental. B. a wind chime. C. an organ pipe. D. a telephone. 22. An antinode in a standing wave is the location that appears to ___have largest displacement_________ (describe behavior) in equilibrium. 23. The number of cycles of a periodic wave passing a point in space per second is called the _________frequency_________ of the wave. 24. The product of the frequency of a periodic wave times its wavelength gives the _______speed__________ of the wave. 25. Sound waves in water have a higher _________speed_______ than sound waves in air. 26. Constructive interference is a result of two waves arriving at a point _______in phase_______________. 27. When fans do "the wave" at a sports stadium, it is a ___transverse__________ (transverse or longitudinal) wave. 28. The lowest frequency that can be made by a guitar string is called the ___fundamental frequency or first harmonic_________
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