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Sound and Wave Test Review

Sound and Wave Test Review. 1. If two wave pulses traveling on the same side of the wave crossover, what type of interference will occur? ans : constructive

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Sound and Wave Test Review

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  1. Sound and Wave Test Review 1. If two wave pulses traveling on the same side of the wave crossover, what type of interference will occur? ans: constructive 2. Two wave pulses travel toward each other on opposite sides of the wave crossover. Both pulses measure at 2 cm. What is the size of the wave at the point of crossover? ans: zero

  2. 3. What type of wave interference occurs in #2? ans: destructive 4. A pulse traveling east is displaced by 3 cm while another pulse travels west. At the point of crossover the displacement pulse is measured to 5 cm. What is the displacement of the pulse that is traveling to the west? ans: 2 cm 5. What type of interference occurs in #4? and constructive

  3. 6. When does the cancellation of the wave pulse occur? ans: when the pulses are on opposite sides and at the point of crossover 7. Frequency is the cycles/s. This means that the period is ____________? ans: s / cycle 8. In the pendulum lab, if the rubber stop swung 15 time in 5 s, the frequency is __________. ans: 3 cycles / s

  4. 9. In the pendulum lab, the rubber stopper swung 10 times in 5 s, what is the period? ans: 0.5 s / cycle 10. On a rainy day, you watch the rain drip off the edge of the window. If you count 3 drop each 2 seconds and the speed of a drop is 2.45 m/s, what is the distance between each drop? ans: 1.633 m between drops 11. With a water wave, if you increase the time you slap the water for 10/s to 20/s, the wavelength of the wave generated would ____? ans: decrease the wavelength

  5. 12. Draw the wave pulse at the point of crossover? 3cm 5cm 13. What is the speed of a wave that has a wavelength of 2.5 cm and vibrates at a period of 4 s/cycle? ans: 0.625 cm/s

  6. 14. The position on a wave that show the energy supplied is equal to the energy of the wave is called the______? ans: node 15. A sound has a frequency of 205 800 Hz and a wavelength of 0.025 m. What is the speed of this wave? ans: 5145 m/s 16. If the speed of sound in the air is 343 m/s, through what medium would you guess the sound is traveling in #15? ans: solids, 15x faster

  7. 17. A wave pulse travels down a string tied to a wall. Describe the wave behavior as the pulse strikes the wall. ans: reversed and flipped • How many wave segments are there is a single wavelength? ans: 4 19. Whole number multiples of the frequency of a wave is called ____________? ans: harmonics

  8. 20. What type of wave is composed of a series of compressions and rarefraction? ans: Longnitudual wave 21. If the pitch increases, then the wavelength __ ans: decrease 22. If the pitch increases, then the speed of sound at the same temperature and pressure will? ans: remain the same

  9. 23. Loudness makes the speed of the sound wave increase? ans: False 24. In an open-ended resonator that is 0.5 m long, what is the frequency at the 1st harmonic at 20oC? ans: 343 Hz 25. In a closed-ended resonator that is 0.5 m long, what is the frequency at the 1st harmonic at 20oC? ans: 171.5 Hz

  10. 26. Compare #24 and #25. Which tube would have the higher pitch? ans: 343 Hz , #24. 27. What is the period of a pendulum if the length of the pendulum is 34.8 m? ans: 11.8 s 28. What is the period in #27 affected with the length of the pendulum is decreased? ans: decrease the period

  11. 29. How is the period of the pendulum in #27 affected with an increase in mass? ans: no change. 30. The reflection of a sound wave off a hard surface is called a(n) _______? ans: echo 31. If it take 5 s for you to hear your echo, how fast is the sound traveling at 20oC ? ans: 343 m/s constant 32. How far is the reflective surface in #31? ans: 857.5 m

  12. 33. A sound source has a frequency of 750 Hz is moving at 45 m/s toward a sound meter setting at rest. What is the apparent shift in frequency detected by the meter? ans: 863.3 Hz 34. What is the apparent shift in frequency as the sound source in #33 move away from the meter? ans: 663 Hz

  13. 35. What part of the human ear transfers impulses to the brain? ans: nerve hairs in the cochlea 36. What is the standard speed of sound at 20oC at sea level? ans 343 m/s 37. At sea level, what is the speed of sound at 25oC? ans: 331 m/s + (0.6 x 25oC) = 346 m/s

  14. 38. When two different objects vibrate at the same frequency, they are said to be in: ans: resonance 39. What type of resonator is open at both ends? ans: open ended resonator 40. In a sound lab, what is the relationship between the vibrating tuning fork and the vibrating air inside the tube? ans: directly proportional

  15. 41. The vocal code vibrate to product speech. 42. What type of resonator is claosed at one end? ans: closed ended resonator 43. Putting together wave frequencies in whole number multiples is called: ans: harmonics 44. A chord that is pleasant to hear, ans: consonance

  16. 45. The standard unit for frequency is ans: Hertz, Hz or cycle/second 46. The difference in the frequency of two waves is called the ans: beat 47. Tone color and sound quality is the same name for: ans timbre 48. Two tuning forks one 393 Hz and other 423 Hz, what is the beat ans: (fa – fb) ; (423 Hz – 393 Hz ) = 30 Hz

  17. 49. Open ended resonator @ 25oC , 1.25 m. ans: f = v/2L = 346 m/s / (2*1.25) = 138.4 Hz 50. Closed ended @ 25oC, 1.25 m ans: f = v/4L = 346 m/s / (4*1.25) = 69.2 Hz 51. What is the speed of a wave in iron rod with f = 3500 Hz , 0.25 m long? ans: v = λf : v = .25m(3500/s) = 875 m/s 52. A speed at 900 m/s and f = 450 Hz ans: v = λf ; λ = 900 m/s / 450/s = 2 m

  18. 53. Closed ended. @18 cm and 3.2 m ? ans: @ 0.18 m f = v/4L; 343 m/s / (4*.18) = 476.4 Hz @ 3.2 m f = v/4L; 343 m/s / (4*3.2m) = 26.8 Hz 54. Velocity at 20oC = 343 m/s 55. An apparent change in the frequency is ans: Doppler Effect 56. What type of wave is a sound wave? ans: longitudual

  19. 57. How much faster does sound travel in solid co,pared to air at 20oC ? ans: 15x 58. How is sound measured? ans: decibels, db 59. What is the lowest frequency heard by the human ear? ans: 20 Hz 60. What is the smallest λ detected by the ear? ans: 17.2 m

  20. 61. Frequency is to pitch as amplitude is to ans: loudness 62. As pitch decreases: frequency : decrease speed: unchanged at the same temp wavelength: increase loudness: decrease

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