Waves

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Waves

• LAB (PLUS)

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3 in A2 Open VA.exe
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4 Click ON in upper left and whistle 5
Volunteers? One note change pitch Watch BOTH
graphs 2 whistlers BOTH Graphs
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1 Open A3 folder and open NetLogo4.1.3 exe 2
File ? Open and get to A1_Sound Workbench 3
Click on Recorder button. Click again to stop.
Click and then go to VA screen. 4 Notice? Use
other buttons 5 NOTE 3 Similarities and 3
differences between one button and another
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3 Similarities and 3 differences between one
button and another
Similarities 1. 2. 3.
Differences 1. 2. 3.
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Purpose of Lab With a partner look to find
patterns in sounds from different instruments or
by changing the properties of the waves i
Topics to be Able to Address Properties of
Waves with Higher and Lower Pitch Properties of
Waves that are Louder and Softer ii Using BOTH
Graphs compare two or more sounds in terms of
SIMILARITIES and DIFFERENCES click Off to
snap-shot wave
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PRESENTATIONS OF WHAT WE FOUND
i Topics to be Able to Address Properties of
Waves with Higher and Lower Pitch Properties of
Waves that are Louder and Softer ii Using BOTH
Graphs compare two or more sounds in terms of
SIMILARITIES and DIFFERENCES
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• Some notes

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(7) Science concepts. The student knows the
characteristics and behavior of waves. The
student is expected to (A) examine and
describe oscillatory motion and wave propagation
in various types of media (B) investigate and
analyze characteristics of waves, including
velocity, frequency, amplitude, and wavelength,
and calculate using the relationship between
wavespeed, frequency, and wavelength (C)
compare characteristics and behaviors of
transverse waves, including electromagnetic waves
and the electromagnetic spectrum, and
characteristics and behaviors of longitudinal
waves, including sound waves (D) investigate
behaviors of waves, including reflection,
refraction, diffraction, interference, resonance,
and the Doppler effect (E) describe and
predict image formation as a consequence of
reflection from a plane mirror and refraction
through a thin convex lens and (F) describe
the role of wave characteristics and behaviors in
medical and industrial applications.
http//ritter.tea.state.tx.us/rules/tac/chapter112
/ch112c.html
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Types of waves A wave is a disturbance that
transfers energy from one place to another
without requiring any net flow of mass. For now,
we'll focus on mechanical waves, requiring a
medium in which to travel. Light, and other
electromagnetic waves, do not require a medium
we'll deal with those later in the
semester. Waves can be broadly separated into
pulses and periodic waves. A pulse is a single
disturbance while a periodic wave is a
continually oscillating motion. There is a close
connection between simple harmonic motion and
periodic waves in most periodic waves, the
particles in the medium experience simple
harmonic motion. Waves can also be separated
into transverse and longitudinal waves. In a
transverse wave, the motion of the particles of
the medium is at right angles (i.e., transverse)
to the direction the wave moves. In a
longitudinal wave, such as a sound wave, the
particles oscillate along the direction of motion
of the wave. Surface waves, such as water waves,
are generally a combination of a transverse and a
longitudinal wave. The particles on the surface
of the water travel in circular paths as a wave
moves across the surface.
http//physics.bu.edu/duffy/py105/Waves.html
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Wave Motion The easiest wave to visualize is a
water wave. When a pebble is dropped in a calm
pool of water, ripples travel out from the point
where the pebble enters the water. The
disturbance travels out from the center of the
pattern, but the water does not travel with the
wave. Mechanical wavessuch as water waves, waves
on a rope, waves in a spring, and sound
waveshave two general characteristics A
disturbance is in some identifiable
medium. Energy is transmitted from place to
place, but the medium does not travel between two
places.
http//www.cliffsnotes.com/study_guide/Wave-Motion
.topicArticleId-10453,articleId-10423.html
a wave pulse is a short wave with no repeated
oscillations http//wiki.answers.com/Q/What_is_the
_definition_of_wave_pulse
Kahn Video https//www.khanacademy.org/science/ph
ysics/waves-and-optics/v/amplitude--period--freque
ncy-and-wavelength-of-periodic-waves
Low level review http//www.physicsclassroom.com/
reviews/waves/wavesans2.cfm
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• Possible Lesson Episodes (chunks) Primary
  focus on Properties of PERIODIC Waves (Frequency,
  wave length, amplitude, how waves can combine and
  some engagement with speeek ).

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Possible Chunks

• See LP need an objective-type statement at
  beginning so kids can get a heads up on what
  were doing
• E.g., Today were going to look at the shapes of
  waves and what these shapes can mean.
• Having some of the info. (like this) in a ppt
  allows you to leave it up as you move around the
  room
• Kinds of waves we are going to talk about/make
• Could do a matching activity as a warm up
  2x2 table Pulse or Periodic and Long or
  Compression give brief intro. who remembers
  or here are some definitions that may be new but
  we want you to start to try using have a few
  a, b, c .. to place letters in cell and then
  add in what they think is the appropriate cell
  images/examples might use at the end of this
  ppt, then add in at least two other examples of
  waves that they you about in the location where
  you think they belong dont rush going over
  this part for letters might just point to all
  for cells and ask how many put a here?
  record number here ..record number etc
  most of you put a in this cell, does someone
  want to say why? (see if you can use definitions
  or descriptive language) anyone have another
  one to add to this cell? So a and this
  example are alike in that they And yes, this
  could meet the Formative Assessment Requirement
• Now going to make, with our bodies, two kinds of
  waves do activity, what moves or doesnt move?
  Estimate in meters per second how fast our pulse
  waves moved? Which was faster? Why? Which kind
  in the physical world is usually faster (table of
  speeds?
• What would we have to do to create periodic
  waves? the ones with freq. etc. that we need to
  focus on for this lesson
• Look at sound waves properties of wave and how
  they relate to sound.
• May get to Speed of waves related to frequency.

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Chunks 2

• Look at waves from two instruments to get at
  properties and to note that waves add
• What instruments?
• What do we notice?
• What is the same or different?
• gtbasically practicing making observationslt
• Then to computer stations? what want them to
  do? How record? (so that they can share later or
  at least give you something to look over)
• Find three patterns (pitch, sound, loudness,)
  that are the same across the instruments see
  if can connect to formal definitions of
  amplitude, frequency,
• How are three instruments sounds for a given
  pitch the same? Different?
• What else would you like to investigate about
  instruments/sound?
• Report out results? Require to use formal words

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(in NetLogo models library)
Could make an unbound (no reflection back of the
wave) version of this if youd want Maybe as
part of an intro to what theyll see on the
oscilloscope portion of the screen the top
graph top graph or maybe you can just say
the top images is a picture of the wave and
discuss what the axes are labeled (time may
matter in needing to get to the exploration part
of the lesson).
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Need to think about what you want to be available
to students to work with these are some
possibilities..
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We will figure out, as best we can, how to make
the setup availability of machines work for you.
MAC this is what youve seen
http//mac.softpedia.com/get/Audio/AudioXplorer.sh
tml
PC not yet sure if this is the best for PC
more on next slide
http//www.sillanumsoft.org/download.htm
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Other possible sites for Windows SW
http//www.techmind.org/audio/specanaly.html http
//www.hitsquad.com/smm/freeware/SPECTRUM_ANALYZER
S/ http//www.hitsquad.com/smm/programs/VA/ http
//www.sillanumsoft.org/ http//en.softonic.com/s/
spectrum-analyzer http//zelscope.en.softonic.com
/ http//ag-works.net/plugins.sg1.htm http//bed
roomproducersblog.com/2011/06/24/bpb-freeware-stud
io-best-free-spectrum-analyzer-vst-plugins/ http/
/mdsp.smartelectronix.com/freakoscope/ http//ww
w.dxzone.com/cgi-bin/dir/jump2.cgi?ID3428 http//
www.dxzone.com/cgi-bin/dir/jump2.cgi?ID3428 htt
p//www.dxzone.com/catalog/Software/Oscilloscope/
http//www.dxzone.com/catalog/Software/Oscilloscop
e/ http//www.dxzone.com/cgi-bin/dir/jump2.cgi?I
D27675
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The following slides have images etc. that might
be used in warm up or elsewhere in lesson
Periodic Compression?
Possible ans?
Pulse long
Place the letters for these (and some others)
into the table
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