Physics Waves & Sound
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1 Read Page 298 (Wave Characteristics) TQ1. How is a pulse different from a wave? Physics Waves & Sound Day 1 TQ2. What actually moves down a slinky when in the form of a wave? TQ3. What two things happen when a wave hits a hard boundary? TQ4. What is the largest difference between a mechanical wave and an electromagnetic wave? Also give, one example of each. TQ5. What is the largest difference between a longitudinal and a transverse wave? Give an example of each. CQ6. Go to as it says in the book and look at the simulation videos. Sketch what a longitudinal wave and what a transverse wave looks like. CQ7. On the diagram below, indicate where the crest, the trough, the amplitude, and the wavelength are located. TQ8. What is the symbol for wavelength and what are the units for wavelength? CQ9. Why is there no sound in space, but there is sound here on Earth? CQ10. How are the individual particles moving through a medium in a transverse wave? CQ11. Which two points on the wave below are in phase? Which two points would be 180 out of phase? TQ12. What are the two ways to calculate the wavelength of longitudinal waves? CQ13. On the diagram below, indicate the areas of compression, rarefaction, and show one wavelength. CQ14. On the diagram below, which two points could you measure to find the wavelength? Also, what is the direction of motion of the particles of Point A as it moves to the right?
2 Read Page 304 (The Wave Equation) TQ15. What does frequency mean? TQ16. What are the two units for frequency? TQ17. What does period mean? TQ18. What are the units for period? Physics Waves & Sound Day 2 TQ19. What is the equation that relates period to frequency? QQ20. What is the period of a 180 Hz electromagnetic wave traveling 3.0 x 10 8 m/s? QQ21. Middle C on a piano has a period of sec. What is the frequency of a C note? TQ22. Electromagnetic waves moves at the speed of light. How fast is the speed of light and what is the symbol we give for this important number? TQ23. What is the equation for the velocity of a wave? CQ24. Which graph below represents the relationship between frequency and wavelength? QQ25. The speed of sound is 340 m/s and an A note was played which has a frequency of 440 Hz. What is the wavelength of the sound wave? QQ26. The speed of light is 3.0 x 10 8 m/s and blue light has a wavelength of 4.0 x 10-7 m. What is the frequency of this electromagnetic wave? CQ27. If the amplitude is doubled, what happens to the wavelength of the wave? QQ28. The wave shown below has a frequency of 2.0 Hz. First determine the wavelength of the wave and then calculate the speed of the wave.
3 Day 3 Read Page 306 (Sound Waves) TQ29. How does sound actually travel through the air? TQ30. What is the speed of sound at standard temperature and pressure (STP)? QQ31. A boy yells into a canyon and hears his echo almost exactly 6 seconds later at STP. How deep is the canyon (hint: keep in mind the echo had to travel to the bottom of the canyon and back)? QQ32. There is a G note on a piano that has a frequency of 784 Hz. If played at STP, what is the wavelength of that G note? TQ33. If one certain frequency is played and it causes another object to vibrate, the object is said to have the same what? TQ34. What is the phenomenon called where one frequency causes another object to vibrate? An example is an opera singer breaking glass with her voice? CQ35. When air is blown across the top of an open water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced.
4 Day 4 Read Page 309 (Interference) TQ36. If you have three dollars and your friend has 4 dollars, and you pull your money together, you will have 7 dollars. This is a model for what principle? CQ37. According to the principle modeled in TQ36, what would be the result of a wave with a magnitude of +5 and a wave with a magnitude of -3 when they interact together? TQ38. What type of interference is TQ36 a model for? TQ39. What type of interference is CQ37 an example of? QQ40. When the two pulses below (Pulse A and Pulse B) are superposed, what will be the result? CQ41. Two waves, one of 5 cm and one of 10 cm, are moving towards each other as shown below. Sketch and indicate the size of these waves when (a) they superpose on each other and (b) when they have passed through each other. Initial Superpose Pass Through CQ42. The diagram below shows wavelengths of water waves passing through openings A and B in a barrier. Is Point P constructive or destructive interference and what happens to the amplitude of the wave?
5 Day 5 Read Page 312 (Standing Waves) CQ43. The diagram below represents a standing wave. How many nodes are present and how many antinodes are present? CQ44. What is the wavelength of the standing wave in the rope shown below? QQ45. If the students above are making the wave shown in the picture at a frequency of 0.25 cycles per second, what is the speed of the wave pattern? Read Page 315 (Doppler Effect) TQ46. During the Doppler Effect, what property of the wave will change if there is motion in either the observer or the source of the sound? TQ47. If the source and/or the observer move toward each other, what happens? CQ48. An ambulance siren is playing a tone of a frequency 400 Hz. If the ambulance is moving toward you what could the frequency be of the tone? CQ49. As Ms. Sheila is yelling at a student, the student moves away in fear for their life. What happens to the frequency and what happens to the amplitude of the sound? TQ50. What scientific evidence proves that the universe is expanding?
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