Physics 20 Waves Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following conditions are necessary for oscillatory motion? 1. The motion must be repeated. II. The frequency must be constant. III. The period must be less than one hour. a. II and III only c. I only b. I and II only d. I, II, and III 2. A pendulum takes 0.25 s to swing from right to left. What is its frequency of oscillation? a. 1.0 Hz c. 2.0 Hz b. 3.0 Hz d. 4.0 Hz 3. Which of the following are conditions for simple harmonic motion? I. The frequency must be constant. II. The restoring force is in the opposite direction to the displacement. III. There must be an equilibrium position for the motion. a. II only c. I and II only b. I only d. I, II, and IIIName: Suspended Spring Supports Mast A spring has a length Z, when it is suspended with no mass attached and a length L, when a mass m is attached. Assume that the mass of the spring does not affect the calculations. (The dingram is pol to scale. ) losed Pipe conance Rest position of mass suspend on the spring Rest position of spring with no mass attached Tuning It 4. Refer to the diagram Suspended Spring Supports Mass to answer this question. A 5.20-kg mass is suspended from a spring that has a spring constant of 4.85 x 10' N/m. The mass is relea and, after a little while, comes to rest below the point at which the spring is suspended. How far has the spring been stretched from its position at which the restoring force is zero? a. 13.2 cm b. 15.1 cm C. 10.5 cm d. 12.6 cm 5. A 3.92-kg pendulum bob is attached to a 4.50-m-long string. The pendulum is pulled sideways until th makes an angle of 18.5" with the vertical. What is the restoring force acting on the pendulum? a. 3.89 N C. 3.74 N b. 12.2 N d. 12.7N 6. Which of the following factors affect the period of a pendulum? I. the length of the string supporting the bob II. the mass of the bob III. the acceleration due to gravity in the region of the pendulum a. I and III C. I, II, and III b. I and II d. II and III 7. Which of the following is an example of mechanical resonance? a. A pendulum gradually loses amplitude. b. A tree branch oscillates in the wind. C. A mass suspended on a spring is pulled down and released. d. A bell ringer pulls on a bell rope to keep the bell ringing.8. Which of the following is a forced frequency acting on the oscillation 7: fergus 1. A pendulum skims the surface of a pool of water at the lowest point of motion II. To keep a bell ringing, a bell ringer pulls on a bell rope. III. A singer shatters a glass. a. 1, II, and III ha. I and II C. II and III d. I and III Wave Phase Points B K 100000 30908009 0604 C J H M N R sgrum Hareemails P The spring constant of the spring is 9. Refer to the diagram Wave Phase Points to answer this question. Listed below are four pairs of points from the wave train in the diagram. For which of these pairs of points is the distance between them equal to one wavelength? I. C and G 25 . S car moving away from you II. A and J III B and K IV. D and M a. I, II, and IV C . I, III, and IV b. II, III, and IV d. I, II, and III 10. When a transverse wave moves through a medium, the medium a. moves back and forth parallel to the motion of the wave as it travels in the direction of wave motion. b. moves back and forth across the direction of motion of the wave but generally stays in the same place. C. moves back and forth parallel to the direction of the wave's motion but generally stays in the same place. d. moves back and forth across the direction of motion of the wave as it travels in the direction of wave motion.11. Which of the following affect the length of the way I. the amplitude of the wave II. the period of the wave Ill, the tension in the spring I. II. and III I and III only II and Ill only I and Il only Doppler Waves 12. A bat emits squeaks that have a frequency of 1.25 x 10' Hz If the speed of sound i'llris 325 mrs. whatis " the wavelength of the bat's sonar? a. 2.60 mm C. 3.85 mm 3.85 cm d. 2.60 cm Standing Wave Pattern in a Spring X E 13. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question. The number of wavelengths in the diagram is a. 12 b. 4 d . The thanrom s 14. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question.sure For which of the following pairs of points is the distance between them equal to one wavelen I. A and C II. B and D III. C and E a. I and III only C. II and III only b. I only d. II only 15. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question. Which of the following sets of points indicate the position of antinodes? a. A, B, and C C. A, B, and E b. B, C, and D d. A, C, and Ea. A wave in a spring, stretched to a length of 3.60 m, travels at a speed of 2.80 mis. What is the lowest resonant frequency for this spring? 1,02 HE 0.389 Hz 17. If you blow across the top of an empty bottle to create a sound with a wavelength a. what is the length of 0.778 Hz d. 0.572 Ha cavity inside the bottle in terms of the wavelength of the sound? The : chalk d. Closed-Pipe Resonance A tuning fork held over a closed pipe produces resonance for particular lengths (). sample barmean pendu (This diagram is not to scale.) Tuning fork B Tuning fork A Sliding closed-pipe tube Water 18. Refer to the diagram Closed-Pipe Resonance to answer this question. A tuning fork is held over the end of a variable-length closed pipe. The length (L) of the pipe is increased. As the pipe gets longer, the sound of the tuning fork first gets softer, then louder, then In terms of the wavelength of the sound produced by the tuning fork, which series of numbers r possible values for the length of the pipe at which you would hear the softest sound? c. L = 12 and = 2 N a. L = = land - a d. L= - a and - 2 b. L = = 2 and - aIn: 1 Namici Two point Interference Two in-phase point sources in a ripple tank, S, and Sp. genernie the interference pattern shown below. 5, and S, are 4A apart. The maxima and minima are labelled from K to R Prs: PIS: KEY: Houl PI'S. KEY: simple S 2 PTS. 19. Refer to the diagram Two-point Interference Pattern to answer this question. If the distance between the sources S, and S, is decreased slightly, which of the following would occur I. The distance between lines P and Q would increase. II. The number of maxima and minima would increase. III. The sources would no longer be in phase. a. I only C. I and II b. III only d. II and III 20. Refer to the diagram Two-point Interference Pattern to answer this question. A point located on the line labelled M is found to be 1.10 cm closer to S, than it is to S2. If the speed of the waves in the ripple tank is 4.68 cm/s, what is the frequency of the wave generator? a. 2.84 Hz C. 1.70 Hz 2.13 Hz d. 4.25 Hzb. 21. When the source of a sound wave is moving toward an observer, which of the following will appear to occur? The apparent speed of the wave is less than the true speed of the ways. d. The apparent wavelength of the sound is less than the true wavelength of the sound. The apparent wavelength of the sound is greater than the true wavelength of the sound. The apparent speed of the wave is greater than the true speed of the ways. Doppler Waves altered When a wave source is in motion, the wavelengths in front of and behind the soares wire (This diagram is not to scale.) Wave fronts Wave source join tork a Direction of motion The diagram shows the wave fronts created by a sound source moving to the right. The waves that precede 22. Refer to the diagram Doppler Waves to answer this question. the source have a wavelength (1, ) of 1.40 m, while those that trail the source have a wavelength (2, ) of 1.80 m. If the speed of sound in air is 326 m/s, what is the true frequency of the source? c. 204 Hz d. 233 Hz a. 181 Hz b. 197 Hz