Waves & Sound

Documents you may need:

Waves Vocabulary Sort (pdf) (This is Activity #23 and needs to be completed in your Notebook) (You will need to cut out each word and definition and then make three (3) columns in your Notebook and arrange them as follows: 1) Vocabulary Word, 2) Definition, and 3) Draw a Picture or Visual Representation of each word)

Waves on a String Lab (pdf) (This is Activity #26 and needs to be completed in your Notebook)

Wave Practice Problems: Pg. 386 #15, 16, 18, 19, 20, 21; pg. 398 #81, 82 (Show GUESS for ALL calculations!) (This is Activity #27 and needs to be completed in your Notebook)

NOVA Tsunami Questions (google doc) (This is Activity #28 and needs to be completed in your Notebook)

Ch. 14 Study Guide (pdf is better than the google doc) (Answer Key to check your responses)

Wave puzzle (back of study guide) (pdf)

Slinky CER lab (pdf or google doc)

Waves Worksheet (pdf or google doc)

Sound Stations Lab (pdf or google doc)

Resonance (Speed of Sound) Lab (pdf or google doc) (This is Activity #___ and needs to be completed in your Notebook)If you were absent use this simulation to complete the lab. (Keep this in mind when using this simulation: "In the simulation, resonance is shown by the amplitude of the wave in the air column. The larger the amplitude, the closer to resonance.")

Ch. 15 Study Guide (pdf or google doc)

Waves Review Worksheet (pdf or google doc)

Thinking About Waves in class activity (pdf or google doc)

- Answers to Activity above (pdf or google doc)

Additional study guides to help you:

Open Column Study Guide (pdf)

Closed Column Study Guide (pdf)

Resonance Concept Map (pdf)

Types of Sound problems concept map (pdf)

Lecture Notes you may need: (you will need to be signed in to your PUSD Google account in order to access them)

Waves (This is for reference only)

Wave Interactions (This is Activity #29 and needs to be completed in your Notebook)

Sound (This is Activity #30 (slides #1-7), Activity #33 (slides #8-20) and needs to be completed in your Notebook)

Doppler Effect (This is Activity #34 and needs to be completed in your Notebook)

Supersonic (This is Activity #34 and needs to be completed in your Notebook)

Beats (This is Activity #35 and needs to be completed in your Notebook)

Air Resonance

Resonance

Homework Help

Homework Packet list:

Waves & Sound Homework Packet

1. Ch. 14 Study Guide (stamped twice)

2. Wave Puzzle (on back of Ch. 14 Study Guide)

3. Waves Worksheet

4. pg. 386 #18, 20; Pg. 386 #22, 23

5. pg. 397 #68, 398 #78; pg. 419 #22; pg. 424 #32, 36, 43, 44, 47; pg. 425+ #52-54, 56

6. pg. 424 #66 & 86; pg. 425 #60 & 61

7. pg. 410 #16, 17; pg. 424 #34, 68-70

8. pg. 409 #8, 9, 10; pg. 425 #49, 91

9. pg. 396 #56, 57, 58; pg. 424 #37, 38; pg. 425 #77

10. pg. 419 #23, 28; pg. 426 #78, 84, 87, 88

11. pg. 424 #41, 50, 51; pg. 425 #71, 72

12. DWQs (15)

February 26th, 2016: pg. 427 #84, 85, 87, 88

84. Think about how the metal fingers would vibrate. They are attached on one end and can only vibrate up and down on the other end. They would make a similar displacement graph as a closed tube. Only a quarter of a wavelength can fit on the finger. Use that relationship with the length provided in meters to determine the wavelength. Use that wavelength and the frequency given to find the speed. (<200)

85. Refer to pg. 405 for a table of the speed of sound in different materials. Since it is an open pipe, at the fundamental we know a half of a wavelength fits inside of it. Use that relationship and the length provided to determine the wavelength. With the speed you found in the table find the frequency. (<300)

87. This is a Doppler Shift problem. You know everything but the speed of sound. (<500)

88. Remember that the speed of sound is 331m/s in 0 degrees Celsius and raises 0.6 m/s every degree above that.

pg. 425 #71; pg. 419 #26, 28

71. This is just like your lab! The difference between 49 cm and 17 cm is the "spacings between resonances." Just like our practice problems today, use that information to solve for the wavelength and then the frequency. (>500)

26. a. Assume the fundamental frequency. (<40) b. If you hear a 1.4 Hz that means the frequency you found in (a) must be 1.4 Hz larger or smaller than this second pipe that is being played. You are told that the second pipe is too long. If it also resonates than a longer pipe would mean a longer wavelength and a shorter frequency. Use that information to solve for the frequency of the second pipe. (<35) Since you now know the frequency and the velocity you can solve for the wavelength. If this second pipe also resonates at the fundamental then you can find the length. (10)

28. There are two options.

pg. 426 #78, 80

78. (a) Use the constant velocity equation (<2) (b) Use the velocity and wavelength given to determine the wavelength. (>2)

80. "Lowest pitch" = Fundamental. Given the length to wavelength ratio for the fundamental of an open pipe, find the wavelength given that length. With that wavelength and velocity, find the frequency. (>200)February 22nd, 2016: pg. 397 #68; pg. 398 #78; Pg. 425 #52-54, 56

52. Given the time it takes the sound to travel, assume the speed of sound is 343 m/s. Use the constant velocity equation to calculate how far sound would travel in that case. (<2000)

53. Since the echo is heard 3 s later that means the sound wave actually travels across the canyon and back in the three seconds. Assume the speed of sound is 343 m/s. Use the constant velocity equation to calculate how far sound would travel in that case. (>500)

54. What is equal to 1.1m?

56. The camera is waiting to hear the sound it made travel to the cactus 3 meters away and back again. Assume the speed of sound is 343 m/s. Use the constant velocity equation to calculate how long it would take the sound would travel that distance. (<1)

February 18, 2016: Waves Worksheet

#1-6 are conceptual

7. You're given the velocity and the wavelength; solve for the period.

8. Notice the M for Mega in front of Hertz! Use your Unites & Conversions sheet from the beginning of the year to convert to Hertz. Use the equation v=(wavelength) f to solve for the wavelength. (<1)

9. Use the equation v=(wavelength) f to solve for the frequency. (<70)

10.Notice the M for Mega and k for kilo in front of Hertz! Convert to Hertz. You're looking for the range of the wavelength so you need to calculate the wavelength for the high end and low end of the AM and FM frequency band. (AM>FM)

11. Notice the k for kilo in front of Hertz! (<500)

12. Make a sketch of the standing wave with 4 nodes and 3 antinodes. More than one wavelength fits into that wave! That means the wavelength is not 12 m. How much of a wavelength fits? Given that wavelength and frequency solve for the velocity.

February 16th, 2016: Vocabulary Words

Terms you have been introduced to thus far in this unit:

pg. 425 #50, 72, 77, 91

72. Remember that lowest resonant frequency means fundamental and for a closed pipe that means only a quarter of the wavelength fits. (<3000)

77. a. For a standing wave in a string, the lowest frequency (fundamental) would be two nodes and one antinode; that would be only half of a wavelength. Using that relationship you can solve for the length of the wave and using that frequency solve for the wavelength. (>200)

b. Remembering your homework from last night, the next resonant frequencies for a standing wave in a string woul dbe whole number multiples of the initial frequency.

91. First figure out what the second frequency (heard from the moving trumpeter) must be if a beat of 3Hz is heard. Then plug it all into the equation for the Doppler Effect. You can assume the speed of sound in air is 343 m/s. You know the sound that is made by the trumpeter (440 Hz) and what is heard (creating the 3 Hz beats) and that the detector is stationary. (<3)

pg. 410 #16, 17; pg. 419 #34; pg. 424 #68-70

68. Because the car is trying to get away from the fire truck (receding) its velocity is the same as teh velocity of the sound and of the fire truck; its velocity is positive. (<350)

69. Be sure to have all your variables correct! For (a) velocity of the detector is zero but for (b) it is 21 m/s. (a>330, b>350)

70. Be sure to have all your variables correct! For (a) velocity of the detector is zero but for (b) it is 21 m/s. (a 280, b>260)

pg. 424 #66, 86 & Finish Sound Stations Lab

66. Be careful since there are two waves that are being reflected; one off of the mud and one off of bedrock.

a. Given the speed of sound in sea water, and realizing the 1.74 s is the amount of time for the sound wave to go to the bottom and reflect back, calculate the depth of the water using the constant velocity equation. (<2000)

b. It will take the same 1.74 s for the sound wave to travel through the same amount of water but it takes a total of 2.36 s to travel farther down to the bedrock. The difference between the two is how far it travels just in the mud. If the sound spends that long (<1s) in the mud to travel to bedock and reflect back out you can treat it like an echo problem and solve for the depth of the mud. (>500)

86. Since the stone is dropped and pulled down by gravity it will take a certain amount of time to make it to the bottom of the well before the sound can even be made! Use the purple equation to find the time it takes the stone to fall this far. (5) Now that the stone has hit the bottom, the sound wave can travel up that distance at 343 m/s. Calculate that time using the constant velocity equation since sound is unaffected by gravity. Add those two times together to get the total time after dropping the stone it will take for you to hear it hit the well. (>5)