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wave unit

wave unit at sami
by

Mari Thiersch

on 12 May 2013

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Transcript of wave unit

Wave unit Why is Mari going through a prezi Senior project Unit overview
2 Summative days
- 3 conclusions
- 2 quizzes
- 1 additional The overview Formative Day 1 of 6 Formative day 2 of 6 Formative day 3 of 7 Formative day 4 of 7 Formative day 5 of 7 Formative day 6 of 7 6 formative days
- 3 labs (1 due every 2 periods)
- RTN & problem sets
- practice tests Tuesday March 19th Agenda:
- Do now: See, Think, Wonder
- Why is Mari going over a prezi?
- Unit overview with calendar
- Notes:
- What is a wave?
- Classifying waves
- Parts of waves
- Wave application - Sine waves
- "sign" contract and check in

- Lab time
- Exit slip see, think, wonder - connect Part of my senior project is to teach a unit in a math or science class

The goal of my project is to see what kind of teacher I want to be What you can expect from me What I expect from you - Learn
-TRY
- Check in, make mistakes, give input, ask questions - Let learn
- Respect others
- Avoid distractions Today's essential questions:
What is a wave?
What are ways to classify waves?
What are the parts of a wave?
What is sine and what does it have to do with waves? What is a wave? A wave is a transfer of energy without a transfer of matter but through mater or space A medium is the substance or material that the wave transfers through What are ways to classify waves? 1st way
movement of partials
vs.
direction of wave traveling

2nd way
Ability to travel in a vacuum A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves. movement of partials
vs.
direction of wave traveling Ability to travel in a vacuum An electromagnetic wave is a wave that is capable of transmitting its energy through a vacuum (i.e., empty space). Electromagnetic waves are produced by the vibration of charged particles.

Think light waves A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another

Think sound waves What are the parts of a wave? The amplitude is maximum amount of displacement of a particle on the medium from its rest position. The larger the amplitude the more energy the wave carries The trough of a wave is the point on the medium that exhibits the maximum amount of negative or downward displacement from the rest position. The crest of a wave is the point on the medium that exhibits the maximum amount of positive or upward displacement from the rest position The wavelength of a wave is simply the length of one complete wave cycle. What is sine and what does it have to do with waves? Sine is a trigonometric function of an angle, most often associated with triangles and finding angles. 90 soh or sin = opposite/hypotenuse unknown angle hypotenuse opposite The graph of sine The graph of sine is used to model periodic motion, (motion that is regular and repeating) The equation for the graph of sine y= a sin(bx+c)+d you will need this for the "simple harmonic motion lab" each of the letters manipulates the graph differently a - amplitude b - wavelength c - moves entire wave right or left d - moves wave up down Exit task

Are you ready for the quiz? What do you need to do to get ready?

How far did you get in the labs? are you on track to finish?

do you have missing formative work? What is your plan to get it in?


Questions, Comments and/or Concerns about this class? additional resources Kahn academy videos on waves
http://www.khanacademy.org/science/physics/waves-and-optics/v/introduction-to-waves

http://www.khanacademy.org/science/physics/waves-and-optics/v/amplitude--period--frequency-and-wavelength-of-periodic-waves

Devine's notes
http://classrooms.tacoma.k12.wa.us/sami/jdevine/documents/sinusoidal_wave_notes.pdf

Web sites
http://www.physicsclassroom.com/Class/waves/ Thursday, March 21st Agenda:
- Do now: Crossword vocabulary puzzle

- Notes:
- What is the frequency and period of a wave?
- What is the relationship between frequency/period and the equation?
- The speed of the wave vs. medium
- The velocity of a wave
- The wave equation

- Lab set up
- Lab time with check ins
- Exit slip Next class:
Mathematically modeling waves HW: Problem set ____ essential questions last class we looked at
- What are waves
- types of waves
- parts of waves
- sine and its relation to waves today's questions
What is frequency and period? What ais the relationship to each other?
What is the speed of waves and its relationship to mediums?
How do you calculate the speed of waves?
What is the wave equation? The frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium

The unit is often cycles per sec

or

hertz .
1 cycle/sec What is frequency and period? The period of a wave is the time for a particle on a medium to make one complete vibrational cycle The unit is some unit of time Ex. 1 Sami class period is 85min Common misconception What is the relationship between frequency and period? period = 1/frequency frequency = 1/period T=1/f f=1/T I do Frieda the fly flaps its wings back and forth 121 times each second. The period of the wing flapping is ____ sec. we do A tennis coach paces back and forth along the sideline 10 times in 2 minutes. The frequency of her pacing is ________ Hz. you do Olive Udadi accompanies her father to the park for an afternoon of fun. While there, she hops on the swing and begins a motion characterized by a complete back-and-forth cycle every 2 seconds. The frequency of swing is _________. The period of the swing is ________. Homework: RTN327-343 & prelabs - Facilitating this class for the next 8 class periods
- Keeping the original format of this class (1/3 lessons 2/3 lab, formative days, ex.)
- I'm going to make mistakes but I will learn from them
- Clearly stated expectations
- Time to check in with me, ask tons of questions, give input and make mistakes
- Alternative ways to learn subject difference between
- frequency of a wave
and
- speed of a wave A wave can vibrate back and forth very frequently, yet have a small speed; and a wave can vibrate back and forth with a low frequency, yet have a high speed. Frequency and speed are distinctly different quantities. The speed of a wave vs. medium The speed of a wave is dependent on the medium Speed of a wave: You can find the speed of a wave the same way you find the speed of anything

speed = distance/time I do: Noah stands 170 meters away from a steep canyon wall. He shouts and hears the echo of his voice one second later. What is the speed of the wave? we do: Two waves are traveling through the same container of nitrogen gas. Wave A has a wavelength of 1.5 m. Wave B has a wavelength of 4.5 m. The speed of wave B must be ________ the speed of wave A you do: While hiking through a canyon, Noah Formula lets out a scream. An echo (reflection of the scream off a nearby canyon wall) is heard 0.82 seconds after the scream. The speed of the sound wave in air is 342 m/s. Calculate the distance from Noah to the nearby canyon wall. The wave equation speed = wavelength/period
period = 1/frequency
speed = wavelength * frequency I do: we do: you do Mac and Tosh stand 8 meters apart and demonstrate the motion of a transverse wave on a slinkey. The wave can be described as having a vertical distance of 32 cm from a trough to a crest, a frequency of 2.4 Hz, and a horizontal distance of 48 cm from a crest to the nearest trough. Determine the amplitude, period, and wavelength and speed of such a wave. Two waves on identical strings have frequencies in a ratio of 2 to 1. If their wave speeds are the same, then how do their wavelengths compare? Ocean waves are observed to travel along the water surface during a developing storm. A Coast Guard weather station observes that there is a vertical distance from high point to low point of 4.6 meters and a horizontal distance of 8.6 meters between adjacent crests. The waves splash into the station once every 6.2 seconds. Determine the frequency and the speed of these waves. Back to that sine equation f(x) = a sin (bx+c) + d in harmonic motion is written like f(x) = a sin (2nfx+o ) + d b = 2nf or f = b/2n Next class wave interactions with other waves and boundary Exit task: How confident do you feel with the material? What do you need to succeed in this unit?

How far did you get in the lab?

Grade this lesson on the BAME scale

Questions, Comments and/or Concerns about this class and/or lesson? Homework: worksheet two khan academy
http://www.khanacademy.org/science/physics/waves-and-optics/v/amplitude--period--frequency-and-wavelength-of-periodic-waves

websites
http://www.physicsclassroom.com/Class/waves/U10L2b.cfm http://www.armoredpenguin.com/crossword/bin/crossword.cgi?cmd=solve&filefrag=2013.03/1914/19144615.228.html Agenda
- welcome back
- check in ws

- lab time
- exit task entry task: - get a laptop
- go to WKST link
- do this by yourself on a separate piece of paper Exit task Questions

What is topic you feel most confident on? least confident?

How far did you get in the lab?

Questions, Comments and/or Concerns about this class? Thursday April 11, 2013 Agenda
- warm up: did you finish the worksheet?
- notes
- What is wave interference (in 1d and 2d)?
- What is the law of superposition?
- What is the difference between constructive and deconstructive interference and what happens after?

- lab time
- Exit task what will happen ???? essential questions What we have explored
- wave basics
- types of waves
- period/frequency
- the speed of a wave today's questions
- What is wave interference (in 1d and 2d)?
- What is the law of superposition?
- What is the difference between constructive and deconstructive interference and what happens after? Next class wave interactions with boundaries The law of superposition

When two waves interfere, the resulting displacement of the medium at any location is the algebraic sum of the displacements of the individual waves at that same location. The law of superposition displacement of pulse 1 +displacement of pulse 2 = displacement when waves interfere When waves meet at same time and place back to the top Wave interference can be classified into two different categories, constructive and deconstructive interference. What is wave interference? Wave interference is what occurs when two waves meet when traveling along the same medium. What is the difference between? constructive and deconstructive interference and what happens after? Constructive interference- when the two interfering waves have displacement in the same direction t1 t2 t3 deconstructive interference
- when the two interfering waves have displacements in a different direction After interference
- the waves continue on doing what they were doing before the interference. 2-d waves 1 - constructive -"double high" Crest
2- constructive -"double low" trough
3-destructive - flat side view + = 2 1 3 warm-up: answer key to WKST

Agenda
notes
with wave table
- What is reflection?
- What is refraction?
- What is diffraction?

lab time
exit task Tuesday April 16, 2013
Last class we looked a
Wave interference (in 1d and 2d)
The law of superposition
constructive and deconstructive interference and what happens after - What is reflection?
- What is refraction?
- What is diffraction? What is reflection? What will happen when the waves hit the barrier? Looking at the wave table ... Regardless of the angle at which the wave fronts approach the barrier, the waves will always reflect in such a way that the angle at which they approach the barrier equals the angle at which they reflect off the barrier. What is reflection? What will happen when the waves hit the barrier? Looking at the wave table ... Upon reflection off the parabolic barrier, the water waves will change direction and head towards a point. the point is known as the focal point. After passing through the focal point, the waves spread out through the water. Breaking down the law of reflection The ray approaching the barrier is known as the

incident ray The ray that leaves the barrier is known as the

reflected ray The normal line divides the angle between the incident ray and the reflected ray into two equal angles. The angle between the incident ray and the normal is known as the angle of incidence. Theta - i The angle between the reflected ray and the normal is known as the angle of reflection Refraction of waves involves a change in the direction of waves as they pass from one medium to another. The refraction of waves What is diffraction? What will happen when the waves hit the barrier? looking at the wave table diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path. Next class
sound and light waves Warm up review worksheets - the test questions will be very similar (hint, hint) agenda
notes
sound
- What manipulates pitch and loudness?
- What is the Doppler effect?
light
- What is the electromagnetic spectrum?
- How does the eye see the viable color spectrum?
The speed of sound and light


Lab time
What manipulates pitch and loudness? Pitch
- How high or low a sound is

Pitch changes by frequency
higher the sound the higher the frequency

Loudness
- how intense the sound is

loudness changes by amplitude
louder the sound the larger he amplitude
Last class we looked at
- reflection
- refraction
- diffraction sound
- What manipulates pitch and loudness?
- What is the Doppler effect?
light
- What is the electromagnetic spectrum?
- How does the eye see the viable color spectrum?
speed of a light and sound wave
What is the Doppler effect? Doppler effect - the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for the observer and the source are approaching and an apparent downward shift in frequency when the observer and the source is receding As the car approached with its siren blasting, the pitch of the siren sound was high; and then suddenly after the car passed by, the pitch of the siren sound was low. The Doppler effect is observed because the distance between the source of sound and the observer is changing. The Doppler effect is a shift in the apparent or observed frequency and not a shift in the actual frequency at which the source vibrates. What is the electromagnetic spectrum? Electromagnetic waves exist with an enormous range of frequencies. This continuous range of frequencies is known as the electromagnetic spectrum. What is the visual light spectrum? Though electromagnetic waves exist in a vast range of wavelengths, our eyes are sensitive to only a very narrow band. Since this narrow band of wavelengths is the means by which humans see, we refer to it as the visible light spectrum. how our eyes see color? Light that enters the eye through the pupil ultimately strikes the inside surface of the eye known as the retina. The retina is lined with a variety of light sensing cells known as rods and cones.

- retina are sensitive to the intensity of light, they cannot distinguish between lights of different wavelength
- cones are the color-sensing cells of the retina theta i = theta r What is the speed of sound and light? speed of light in a vacuum

3.00 X 10^8 m/s

speed of sound in the air at room temperature

343m/s formative day 7 of 7
Tuesday April 23, 2013 agenda
- entry task, review worksheets answer key

quiz one checklist
question, comments, and concerns
conclusions for labs



lab time - all three labs need to be done by next class period, use the sample data
Full transcript