PD7 Sound by Thomas E Clark https://padlet.com/tec430/4yicbei1k628 (1) How is compression related to sound waves? (2) What is rarefaction? (3) Insert a diagram of a tuning fork that shows compression and rarefaction moving away from it. (4) What is pitch? (5) Who's your favorite character from the movie Pitch Perfect? (6) How does ultrasound work in medicine ( ie. Pediatrics) (7) Explain how the Doppler Effect works with an approaching ambulance (8) What is resonance? (9) What is a decibel? (11) Explain harmonics? (12) Explain what the harmonic series is for a vibrating string ( may require diagram and equations) en-us 2018-03-20 21:12:04 UTC 2025-12-08 12:38:17 UTC hello@padlet.com Daniel R and Joanna Part 1 https://padlet.com/tec430/4yicbei1k628/wish/244760107 1. Compression is related to sound waves because compression can be seen in sound waves when molecules are pressed or forced together which increases density
2. A rarefaction is when the density is decreased in something, the opposite of compression.
4. A pitch is the sensation of a frequency.
5. Bumper
6. Ultrasound works in medicine by using high frequency sound waves to go into your body to hit boundaries in the tissue and their echoes create an image.
3. image: ]]> 2018-03-21 20:54:23 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760107 Carlos and Jonathan https://padlet.com/tec430/4yicbei1k628/wish/244760161 1. Compression is related to soundwaves as compression is part of the particles as they produce one wave.
2. Rarefaction is the particles of the longitudnal waves are spread farthest apart
3. 
4.   Pitch is a perceptual property of sounds that allows their ordering on a frequency-related scale.
5. Fat Amy
6.They use high frequency sound waves and echoes to find certain locations.
7.   The Doppler effect is a change in the frequncy of sound, light, as the source changes position. So as an ambulance gets closer the pitch gets louder
8. Resonance is the reinforcing of sound by reflection from a surface.
9 Decibel is used to measure sound level.
11. A harmonic is an integer multiple of the fundamental frequency of a wave
12

 
]]> 2018-03-21 20:54:34 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760161 Tushar and also David is there too tlakshminarayanan https://padlet.com/tec430/4yicbei1k628/wish/244760491 1. Compression is related to sound waves because it is a region of the sound wave where the particles are the most concentrated
2. Rarefaction is when density is decreased in an air or gas, and where particles of longitudinal waves are farthest apart.
3.

4. Pitch is the frequency of longitudinal sound waves.
5. Goku
6. Ultrasound works in medicine by using high frequency sound waves and echoes to find the location of things.
7. As things move closer together, the preceived fequency becomes higher than the actual frequency
8. Resonance is when an external force makes another system oscillate at a greater frequency.
9. A decibel (dB) is a unit used to measure the intensity of sound comapred to another.
11. A harmonic is the multiple of a reference signal or wave
12. For a vibrating string, all of the nodes of oscillation are placed symmetrically along the string, and the more nodes there are, the higher the harmonic.

]]> 2018-03-21 20:55:45 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760491 Scott, Thomas, and Sam https://padlet.com/tec430/4yicbei1k628/wish/244760496 1. Compression is the part of a wave when the particles are pushed together. Sound is made up of compressions and rarefactions.

2. Rarefaction is the opposite of compression, when molecules are pushed apart.

3.   (picture ended up somewhere else. think it is at the bottom but not sure)

4. Pitch is the quality of sound, based on the rate of vibration.

5. Fat Amy

6. Ultrasound sends high frequency sound waves into the body, which are read when they bounce back to produce an image.

7. According to the doppler effect, as things move closer together, the preceived frequency becomes higher than the actual frequency, altering the sound so it sounds more shrill as the ambulance gets closer.

8. Resonance is the vibration of a large amplitude caused by a small, periodic vibration in the same period as that of the system.

9. A decibel is a measure of loudness.

11. A harmonic is a component frequency of an oscillation or wave.

12. A harmonic series is an oscillation made up of harmonics. On a string, the antinode has the largest amplitude. At the nodes, the amplitude is very small.
 
]]> 2018-03-21 20:55:46 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760496 Rodas, Indira, and Kenneth tlakshminarayanan https://padlet.com/tec430/4yicbei1k628/wish/244760715 1. The compression is related to sound waves by the ptich decreases.
2. Rarefaction are regions of lower molecular density and air pressure less than atmospheric
3. 
4.  A pitch  is an attribute of sensation in terms of sounds that can be ordered on a musical scale. Pitch has two dimensions, chroma which is the similarity of notes and the second which is height, and this increases from low to high. The range of freq that are able to produce a pitch are 30Hz to 5000Hz. This is called the existence region for pitch. 
5. Our favorite character from Pitch Perfect is Fat Amy. 
6.  Ultasounds work in medicine by using high frequency sound waves and their echoes. 
7. The Doppler effect is when the ambulance is approaching you and the siren has a higher pitch than when it is moving away. A change in pitch with the motion of the source also occurs. 
8.  Its where a body that has a natural tendency to vibrate at a certain frequency, can be set into vibration by another body whose frequency of vibration is identical or VERY similar to the natural frequency of vibration of the first body.
9.  A decibel is a unit that measures the intensity of sounds and how long an object/something is. 
11.  Harmonics are additional frequencies that are integer multiples of the transmitted frequency. 
12. A harmonic sereies is defined as multiple intergers of the fundamental frequency. In addition, this can shorten the string to produce a sound that one wishes to make. ]]> 2018-03-21 20:56:42 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760715 Daniel R and Joanna Part 2 https://padlet.com/tec430/4yicbei1k628/wish/244760739 7.  Due to the change in position, sound waves takes less time to reach. 
8. the quality in a sound of being deep, full, and reverberating.
9. Decibel is used to measure sound level. 
11. Harmonics is a wave whose frequency is an integral multiple of the frequency of some reference signal. 
12. Every time additional nodes are added the frequency gets higher. the standing wave pattern at an instant in time has the string moving downward while the other half moves.]]> 2018-03-21 20:56:50 UTC https://padlet.com/tec430/4yicbei1k628/wish/244760739 Henry, Hepsi, And Abel https://padlet.com/tec430/4yicbei1k628/wish/244761030 1. Sound waves are the compression of molecules in the air. 
2. Rarefaction is where the particles of the longitudinal waves are farthest apart. 
3. at the bottom
4.Pitch is the degree of height or depth a tone sound, depending upon relative rapidity vibrations. 
5. Aubrey
6. An ultrasound penetrates through the upper layer of skin and the high frequency sound waves and their echos to create an image. 
7. The Dopler effect describes a change in the frequency of sound and light as the source changes its position.
8. Resonance is the reinforcement of sound as a result of reflecting off of a surface.
9. A decibel is a unit of sound that works on a logarithmic scale. It changes by a measure of 10.
10. There is no #10.
11. Harmonics is the concept that the same material (same tension and diameter will cause different sounds based on length (how most string instruments work).
12. It is based on the concept of harmonics and depends on the touch point on the string, which essentially shortens the string to produce a desired sound. Additionally, this logic can be applied so that different strings may produce the same sound just at a slightly different pitch.


]]> 2018-03-21 20:58:06 UTC https://padlet.com/tec430/4yicbei1k628/wish/244761030 Jacob Cayabyab https://padlet.com/tec430/4yicbei1k628/wish/244761863 1. Compression is when the waves are pushed together to become closer. Sound is made up of these.

2. Rarefaction is opposite to compression; molecules are pushed away.

4. Pitch is the sensation of frequency of a sound wave.

5. My favorite character in Pitch Perfect is Jesse.

6. Ultrasounds use sound waves and echos to create an image of an area.

7.The Dopler Effect is a change in sound and light as the source moves. When amublances are cloe, the pitch is higher.

8.Resonance is an external force how a sound is.

9. Decibels measure the level of a sound.

11. Harmonics are a wave whose frequency is a multiple of a reference's frequency.]]> 2018-03-21 21:01:14 UTC https://padlet.com/tec430/4yicbei1k628/wish/244761863 https://padlet.com/tec430/4yicbei1k628/wish/244763045 2018-03-21 21:06:13 UTC https://padlet.com/tec430/4yicbei1k628/wish/244763045 Taelynn and Sai https://padlet.com/tec430/4yicbei1k628/wish/244763259 1) Compression happens when the molecules of a sound wave are forced/pressed together. 
(2) Rarefaction occurs when molecules are given extra space and allowed to expand in the sound wave. 
(3) Reference picture below.
(4) Pitch is the sensation of a frequency of a sound wave. It is the quality that makes it possible to judge sounds as "higher" and "lower."
(5) I didn't watch Pitch Perfect but based on the trailers, I love Fat Amy's personality. 
(6) Ultrasounds use high frequency sound waves and their echoes. The sound waves travels through a person's body and the tissue reflects waves that are picked up by a probe and relayed into a machine. 
(7) The Doppler effect is a change in the frequency of sound, light, or other waves as the source changes position. In terms of an ambulance, the pitch of the siren is higher was the ambulance comes closer and is lower once the ambulance passes. 
(8) Resonance is the reinforcing/prolonging of sound by reflection from a surface or object. 
(9) Units are standards for measurement of physical quantities. Decibels are units for expressing the ratio between two physical quantities. It is usually used to measure the relative loudness of sounds. 
(10) There is no #10.
(11) A harmonic is an integer multiple of the fundamental frequency of a wave. 
(12) ]]> 2018-03-21 21:07:06 UTC https://padlet.com/tec430/4yicbei1k628/wish/244763259 tlakshminarayanan https://padlet.com/tec430/4yicbei1k628/wish/244763405 2018-03-21 21:07:42 UTC https://padlet.com/tec430/4yicbei1k628/wish/244763405 Daniel Shin https://padlet.com/tec430/4yicbei1k628/wish/244765124 1. Compression is related to sound waves as molecules of the air compress at certain parts of the sound wave.
2. Rarefaction occurs in between intervals of compression where there are spaces with widely dispersed air molecules.
3. 
4.Pitch refers to the particular sensation of a sound wave correlating to its frequency.
5. I've never watched it.
6.Ultrasound is used in medicine to provide accurate imagery of internal organs. Instruments send signals into a region of the body to be tested and can map it by measuring the returning echoes.
7.As an ambulance approaches a stationary target, waves compress and frequency increases as the displacement of the ambulance changes the origin of the wave causing latter ones to have a "head start."
8.Resonance is the further propagation of sound after it reflects from a surface or object.
9.The decibel is the unit of sound. Utilizes a logarithmic scale. Calibrated so that 0 db is the threshold of human hearing.
11.Harmonics are varying results in pitch created by different string lengths while maintaining the same material and diameter.
12.The series of possible frequency values the string can output based on multiples of the fundamental frequency of a wave.]]> 2018-03-21 21:13:51 UTC https://padlet.com/tec430/4yicbei1k628/wish/244765124 Derek, Amrita, Ruchika https://padlet.com/tec430/4yicbei1k628/wish/244765199  
Derek
(1) How is compression related to sound waves? (2) What is rarefaction? (3) Insert a diagram of a tuning fork that shows compression and rarefaction moving away from it. (4) What is pitch? 
  1. Sound waves are fluctuations of the compression of the air within a certain area. Specifically, areas of high pressure are characterized as a noise or sound since the energy is transferred across the particles of air from high to low pressure areas.
  2. Rarefaction is the reduction of the compression of something. In the case of sound waves, the area behind the higher pressure front of the wave is subject to the effect of rarefaction. In the diagram below, this is shown by the squares that have expanded and are longer than the original squares.
  4. Pitch is the sensation of the frequency of a sound wave. High pitch is a high frequency sound and a low pitch is a low frequency sound.
Ruchika
 (5) Who's your favorite character from the movie Pitch Perfect? 
My favorite character from Pitch Perfect is Aubrey. She is tough on her acapella group members, but I see love in her strictness. She is a perfectionist with a big heart.
(6) How does ultrasound work in medicine ( ie. Pediatrics) 
A transducer sends sound waves into the body (does not have to be a pregnant woman) and then receives the echoing waves after they hit soft tissues. When they hit the transducer, they produce electrical signals that are sent to the ultrasound scanner, which creates an image of the internal organs. 
(7) Explain how the Doppler Effect works with an approaching ambulance 
The change in pitch with the motion of the object is the doppler effect. An ambulance for example, has a higher pitch when it is approaching you than when it is moving away.
(8) What is resonance? 
Sound or vibration produced in one object that is caused by the sound or vibration of another object is resonance.

Amrita 
(9) What is a decibel and units?
A decibel is a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale.
(11) Explain harmonics? 
Harmonics are component frequencies of oscillations or waves.
(12) Explain what the harmonic series is for a vibrating string (may require diagram and equations).
For a vibrating string, the harmonic series are what allow instruments like guitars, pianos, and violins to produce music.

 
]]> 2018-03-21 21:14:10 UTC https://padlet.com/tec430/4yicbei1k628/wish/244765199 https://padlet.com/tec430/4yicbei1k628/wish/244766059 2018-03-21 21:17:42 UTC https://padlet.com/tec430/4yicbei1k628/wish/244766059 Josh Bronner https://padlet.com/tec430/4yicbei1k628/wish/244766164 1. Molecules compress and rarefract meaning that they press together and expand. 
2. Rarefaction is the point in a sound wave where the molecules are the furthest apart. 
3. At end of the questions
4. Pitch is the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone. 
5. My favorite character from Pitch Perfect is Chloe.
6. Ultrasound works by doctors sending high frequency waves that hits the boundary between tissues. This can be used to see developing fetuses and organs. 
7. It can noticed in a ambulance by the frequencies varying in pitch and distance, commanding a driver's attention. 
8. Resonance is the quality in a sound of being deep, full, and reverberating. 
9. A decibel is a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale. 
11. Harmonics is an overtone accompanying a fundamental tone at a fixed interval, produced by vibration of a string.
12. After the first harmonic, all parts of the string vibrate together up and down. ]]> 2018-03-21 21:18:03 UTC https://padlet.com/tec430/4yicbei1k628/wish/244766164 tlakshminarayanan https://padlet.com/tec430/4yicbei1k628/wish/244766884 2018-03-21 21:21:13 UTC https://padlet.com/tec430/4yicbei1k628/wish/244766884 Sven, Adrienne, and Sriharish https://padlet.com/tec430/4yicbei1k628/wish/244767327  
  1.  Compression is related to sound waves because compression of molecules makes a wave. 
  2.  Rarefaction is a region in a longitudinal wave where the particles are farthest apart.
  3.  (Featured at the end)
  4.  Pitch refers to the sound a certain wave makes, which can be described as higher or lower. Larger wavelengths typically produce lower pitches while smaller wavelength produce higher sounds. In this way pitch allows for the creation of harmonics (described later on).
  5. My favorite character from Pitch Perfect is Fat Amy.
  6. It works by sending a specific frequency of waves that is able to go through certain mediums. When it reaches a medium it can not pass through it bounces of and the orientation and correlation of the object to the sensor is recorded. This, thereby, creates an image.
  7. As something moves in one direction, the sound waves compress and increase in frequency. Through this process, the sound gets louder, as the frequency increases too. As the ambulance approaches the sound waves compress infront of it. This, then, causes a large sound as the ambulance approaches the listener but it becomes faint as it drives away from the listener. 
  8. Resonance is the ability for sound waves to transfer from object to object across a medium. It is also when an object vibrates causing sound at a certain frequency.
  9.  A decibel is a unit of sound that measures how loud something is. It is measured in a logarithmic format, so the power ratio changes by a factor of 10 when changing from a decibel value of 20 to 30 or 30 to 40.
  10.  Harmonics occur when the same material with the same tension and diameter is used to make different sounds due to different lengths. Harmonics preserve all the aspects of the wave except for wavelength. This works to change pitch.
  11.  A string must be made of the same material with the same tension and diameter to create a harmonic sound. This allows for the creation of the same kind of sound, but at different pitches. Therefore the sounds are harmonic. http://acouseis.com/wp-content/uploads/2017/05/Spkup.gif
]]> 2018-03-21 21:23:04 UTC https://padlet.com/tec430/4yicbei1k628/wish/244767327 https://padlet.com/tec430/4yicbei1k628/wish/244769372 2018-03-21 21:31:38 UTC https://padlet.com/tec430/4yicbei1k628/wish/244769372 https://padlet.com/tec430/4yicbei1k628/wish/244770433 2018-03-21 21:35:36 UTC https://padlet.com/tec430/4yicbei1k628/wish/244770433 https://padlet.com/tec430/4yicbei1k628/wish/244770440 2018-03-21 21:35:38 UTC https://padlet.com/tec430/4yicbei1k628/wish/244770440 Ian and Angelique https://padlet.com/tec430/4yicbei1k628/wish/244773997 1) Alternating compressions for a wave
2)+]]> 2018-03-21 21:51:06 UTC https://padlet.com/tec430/4yicbei1k628/wish/244773997 https://padlet.com/tec430/4yicbei1k628/wish/244812988 2018-03-22 01:42:36 UTC https://padlet.com/tec430/4yicbei1k628/wish/244812988 https://padlet.com/tec430/4yicbei1k628/wish/244813007 2018-03-22 01:42:46 UTC https://padlet.com/tec430/4yicbei1k628/wish/244813007 https://padlet.com/tec430/4yicbei1k628/wish/244813012 2018-03-22 01:42:48 UTC https://padlet.com/tec430/4yicbei1k628/wish/244813012 https://padlet.com/tec430/4yicbei1k628/wish/245065289 2018-03-22 15:38:00 UTC https://padlet.com/tec430/4yicbei1k628/wish/245065289 Neha Bansal https://padlet.com/tec430/4yicbei1k628/wish/245289394 1) The compression of molecules creates a wave.
2.) Rarefaction is where the molecules are the furthest apart.
3) image below
4) Pitch is the sensation of a frequency of a sound wave.
5.) Becca (Anna Kendrick)
6.) In an ultrasound a transducer both sends the sound waves into the body and receives the echoing waves. When the transducer is pressed against the skin, it directs small pulses of inaudible, high-frequency sound waves into the body.
7)When the siren is coming closer, the pitch is higher. When the ambulance is driving past, the pitch drops. The closer you are to the siren, the higher the frequency wave there is.
8) Resonance is the reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighboring object.
9.) A decibel is a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale.
11) Harmonics are the overtones produced by vibrations of string instruments.
12.) A harmonic series for a vibrating string is v = sqrt(T/mu)]]> 2018-03-23 00:55:01 UTC https://padlet.com/tec430/4yicbei1k628/wish/245289394 https://padlet.com/tec430/4yicbei1k628/wish/245665500 2018-03-23 20:58:53 UTC https://padlet.com/tec430/4yicbei1k628/wish/245665500 Ian and Angelique https://padlet.com/tec430/4yicbei1k628/wish/245665624 1) Alternating compressions for a wave
 2) Segment of one cycle of a longitudinal wave during its travel or motion
3)
4) The quality of a sound governed by the rate of vibrations producing it
5) Yes
6)The ultrasound machine transmits high-frequency sound pulses into your body using a probe. The sound waves travel into your body and hit a boundary between tissues,
7) In the time between one wave peak being emitted and the next, the source will have moved so that the shells will no longer be concentric. The wavefronts will bunch up  in front of the source as it travels and will be spaced out behind it.
8) Resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
9) A unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a scale.
11) A component frequency of an oscillation or wave.
12) When we transfer energy to the strings of these instruments, they oscillate at the special frequencies determined by the harmonic series. When we watch the string move when it vibrates at one of the frequencies of the harmonic series, there is a standing wave pattern that is different for each frequency within the harmonic series.]]> 2018-03-23 20:59:47 UTC https://padlet.com/tec430/4yicbei1k628/wish/245665624 Ejike https://padlet.com/tec430/4yicbei1k628/wish/245668523
  • The compression of molecules generate sound waves
  • Rarefaction is where the particles of longitudinal waves are the farthest apart from each other
  • Picture at the bottom
  • The pitch is the degree of height or depth a tone sound, depending upon relative rapidity vibrations by which it is produced
  • My favorite character from the movie Pitch Perfect is Amy
  • An ultrasound uses high-frequency sound waves to make an image of a person's internal body structures. 
  • The rate at which the sound level decreases as the ambulance leaves is much faster than the rate at which the sound becomes louder as the ambulance approaches
  • Resonance is the quality at which sound is transferred from one medium to another 
  • A decibel is the unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale.
  • Harmonic are component frequencies of waves
  • A string must be made of the same material with the same tension and diameter to create a harmonic sound. 







    • ]]>     2018-03-23 21:18:09 UTC https://padlet.com/tec430/4yicbei1k628/wish/245668523     https://padlet.com/tec430/4yicbei1k628/wish/246296231 2018-03-26 21:26:44 UTC https://padlet.com/tec430/4yicbei1k628/wish/246296231