Grade 11 - Physics Chapter 8 - Assignment Name:_____________________ Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. For a mechanical wave, the medium can be defined as a. the average distance between a crest and a trough. b. the average amplitude of the wave. c. the material in which the wave travels. d. the average distance between two crests. Wave Phase Points ____ 2. Refer to the diagram Wave Phase Points to answer this question. Listed below are four pairs of points from the wave train diagram. Which of the pairs of points are in phase? I. A and J II. G and N III. E and N IV. C and L a. I, II, and III b. I, II, and IV ____ c. I, III, and IV d. II, III, and IV 3. When straight waves in a ripple tank pass from a region of deep water to a region of less deep water, which of the following can be observed for the waves? I. The waves slow down. II. The waves speed up. III. The wavelength decreases. IV. The wavelength increases. a. I and III c. II and III b. I and IV ____ d. II and IV 4. Which of the following factors affect the speed of a wave through a stretched spring? I. the amplitude of the wave II. the length of the wave III. the tension in the spring a. I only b. II only c. III only d. I, II, and III ____ 5. A longitudinal wave is generated in a long spring. The locations along the spring where the medium contains only kinetic energy are known as a. compressions. b. rarefactions. c. either compressions or rarefactions. d. neither compressions nor rarefactions. ____ 6. A 2.40-m-long pulse is travelling at a speed of 5.75 m/s in a spring. How long does it take the pulse to pass any point on the spring? a. 0.318 s c. 0.417 s b. 0.375 s d. 0.428 s ____ 7. A 0.982-m-long pulse is travelling in a spring. If the pulse takes 0.224 s to pass any point in the spring, how fast is it travelling? a. 4.05 m/s c. 4.87 m/s b. 4.38 m/s d. 5.16 m/s ____ 8. A bat emits squeaks that have a frequency of wavelength of the bat’s sonar? a. 3.85 mm b. 3.85 cm ____ . If the speed of sound in air is 325 m/s, what is the c. 2.60 mm d. 2.60 cm 9. A wave in a spring has a 0.960-m wavelength. If the frequency of the wave is 2.24 Hz, what is the speed of the wave in the spring? a. 1.81 m/s c. 2.15 m/s b. 1.96 m/s d. 2.33 m/s ____ 10. A spring is stretched to a length of 8.25 m. You generate a wave in this spring by oscillating your hand back and forth at a frequency of 2.38 Hz. If the wave takes 3.25 s to travel to the other end of the spring and back to your hand, what is the wavelength of the wave that you generated? a. 6.04 m c. 5.59 m b. 4.15 m d. 2.13 m ____ 11. A spring is stretched to a length of 6.8 m. You generate a wave in this spring by oscillating your hand back and forth to create a wave with a 1.4-m wavelength. If the wave takes 5.1 s to travel to the other end of the spring and back to your hand, what is the frequency of the wave that you generated? a. 1.9 Hz c. 1.1 Hz b. 1.5 Hz d. 2.3 Hz ____ 12. An ultrasound system for medical use has a frequency of 12.0 MHz. When it passes through bone, the speed of the ultrasound is m/s. When it passes through muscle, the wavelength of this ultrasound is . What is the ratio of the speed of the ultrasound in bone compared to its speed in muscle? a. c. b. d. ____ 13. Which of the following conditions are required for two waves to create a standing wave in a spring? I. The waves must be travelling in opposite directions. II. The waves must have equal amplitudes. III. The waves must have equal wavelengths. a. I and II only b. I and III only c. II and III only d. I, II, and III A Standing Wave Pattern in a Spring ____ 14. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question. For which of the following pairs of points is the distance between them equal to one wavelength? I. A and C II. B and D III. C and E a. I only b. I and III only c. II and III only d. II only ____ 15. Refer to the diagram A Standing Wave Pattern in a Spring to answer this question. The speed of the wave in the spring is 1.81 m/s. If the frequency of the standing wave is 0.850 Hz, the length of the spring is a. 1.43 m c. 3.95 m b. 1.98 m d. 4.26 m ____ 16. The length of an organ pipe in a concert organ is 1.71 m. If the pipe is open at both ends, what is the frequency of the note played by this pipe if the speed of sound is 328 m/s? a. 83.2 Hz c. 89.8 Hz b. 95.9 Hz d. 108 Hz ____ 17. A violin string has a length of 33.0 cm. What is the fundamental frequency for this string if the speed of the wave in the string is 194 m/s? a. 294 Hz c. 335 Hz b. 392 Hz d. 588 Hz ____ 18. When the source of a sound wave is moving away from an observer, which of the following will appear to occur? a. The apparent frequency is greater than the true frequency of the sound. b. The apparent frequency is less than the true frequency of the sound. c. The apparent speed of the wave is less than the true speed of the wave. d. The apparent speed of the wave is greater than the true speed of the wave. ____ 19. A police car that has a siren with a frequency of 525 Hz is approaching you at a speed of 35.0 m/s with its siren on. If the speed of sound in the air is 342 m/s, what is the frequency at which you would hear the siren? a. 628 Hz c. 585 Hz b. 613 Hz d. 556 Hz ____ 20. The speed of sound in air is 326 m/s. What is the speed of a jet if the frequency you hear for its engine is 1.25 times the true frequency? a. km/h c. km/h b. km/h d. km/h Numeric Response 21. A sound wave has a speed of 335 m/s in air. If the frequency of the sound is 256 Hz, what is the wavelength of the sound? (Record your three-digit answer on the answer sheet.) 22. A clarinet is essentially a hollow tube with holes drilled in it to produce an open-pipe resonator. To create the note called middle C, the clarinetist covers the holes along the body of the clarinet to produce a tube that is 64.1 cm long. If the speed of sound in air is 328 m/s, then the frequency of this note is ______ Hz. (Record your three-digit answer on the answer sheet.) Two-point Interference Pattern Two in-phase point sources in a ripple tank, S1 and S2, generate the interference pattern shown below. S1 and S2 are apart. The maxima and minima are labelled from K to R. 23. Refer to the diagram Two-point Interference Pattern to answer this question. A point located on line P is measured to be 2.10 cm farther from S1 than it is from S2. Any point on line K is ______ cm farther from S2 than it is from S1. (Record your three-digit answer on the answer sheet.) 24. A sound source that is moving toward you at a speed of 42.0 m/s has an apparent frequency of . If the true frequency of the sound source is , then the speed of sound is ______ m/s. (Record your three-digit answer on the answer sheet.) Essay 25. The diagram below shows two pulses travelling in opposite directions in the same spring. Pulse P is moving to the right while pulse Q is moving to the left. In the region where the pulses overlap, draw the resultant pulse by applying the principle of superposition.