# Waves Light and Sound Physlets

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Web Activities
Waves, Sound, and Light

General Wave Properties
Physlet - Transverse Wave and Longitudinal Wave
http://www.phy.ntnu.edu.tw/java/waveType/waveType.html
Physlet - Transverse Traveling Wave
http://www.phy.ntnu.edu.tw/java/wave/wave.html
http://www.upscale.utoronto.ca/GeneralInterest/Harrison/Flash/#waves
http://www.glenbrook.k12.il.us/gbssci/phys/Class/waves/wavestoc.html
Animation - Longitudinal Pulse
http://www.physicsclassroom.com/mmedia/waves/lw.html
Diagrams and Explanations – Nature of a Wave
http://www.physicsclassroom.com/Class/waves/U10L1a.html
Diagrams and Explanations – Properties of a Wave
http://www.physicsclassroom.com/Class/waves/U10L2a.html
Physlet – Wave Simulator
http://www.nationalgeographic.com/volvooceanrace/interactives/waves/index.html
Movie – Wave Basics
Movie – Properties of Traveling Waves
Interactive Notes
http://www.stmary.ws/physics/home/notes/waves/default.htm

1.   What do all waves transfer?
2.   Describe the motion of the medium of a transverse wave.
3.   Describe the motion of the medium of a longitudinal wave.
4.   A sound wave is a mechanical wave; not an electromagnetic wave. What does this mean?
5.   A science fiction film depicts inhabitants of one spaceship (in outer space) hearing the sound of a nearby spaceship as it
zooms past at high speeds. Critique the physics of this film.

Superposition and Standing Waves
Physlet - Superposition of Wave Pulses
http://www.phy.ntnu.edu.tw/java/wave/impulse.html
Animation - Standing Wave Formation on a String
http://www.physicsclassroom.com/mmedia/waves/swf.html
Diagrams and Explanations – Behavior of Waves
http://www.physicsclassroom.com/Class/waves/u10l3c.html
Animation, Diagrams, and Explanations – Standing Waves
http://www.physicsclassroom.com/Class/waves/U10L4a.html
Movie – Properties of Standing Waves

6.  Two wave pulses interfere on the same side of a string. Describe the following properties of the resultant wave formation
when the pulses are positioned on the same position on the string:
a. Wavelength
b. Amplitude
7. What is the name of the type of interference that occurs when the wave pulses meet on the same side of the string?
8. Describe what happens to the wave pulses after they interfere with one another?
9. Two wave pulses interfere on opposite sides of a string. Describe the following properties of the resultant wave formation
when the pulses are positioned on the same position on the string:
a. Wavelength
b. Amplitude
10. What is the name of the type of interference that occurs when wave pulses meet on the opposite side of the string?
11. Describe what happens to the wave pulses after they interfere with one another? Did your answer to this question change
12. Standing waves form when at least two other waves interfere. On a standing wave, a pattern of nodes and antinodes will
form.
a. Describe what is happening with the interfering waves to form a node.
b. Describe what is happening with the interfering waves to form an antinode.
13. What properties must be the same for interfering waves so that they form a standing wave?

Interference and Diffraction of Waves
Physlet - Interference Between 2 Waves
http://www.phy.ntnu.edu.tw/java/waveInterference/waveInterference.html
Physlet - Ripple Tank
http://webphysics.davidson.edu/applets/ripple4/default.html
Physlet - Double Slit
http://www.phy.ntnu.edu.tw/java/doubleSlit/doubleSlit.html
Animations and Videos - Resonance
http://www.regentsprep.org/Regents/physics/phys04/bresonan/default.htm
Animation - 2-Point Source Interference Patterns -Changing Separation Distance
http://www.physicsclassroom.com/mmedia/waves/ipd.html
Animation - 2-Point Source Interference Patterns - Changing Wavelength
http://www.physicsclassroom.com/mmedia/waves/ipl.html
Diagrams and Explanations – Behavior of Waves
http://www.physicsclassroom.com/Class/waves/u10l3c.html
Movies – Interference and Diffraction
Movies –Tacoma Narrows Bridge Collapse
http://www.physics.utoronto.ca/~jharlow/teaching/phy138_0405/lecw02/Tacoma.MOV
http://paginas.fe.up.pt/~jmcarval/fis2/tacoma/tacoma_narrows.mov
http://www.enm.bris.ac.uk/anm/tacoma/tacnarr.mpg
http://www.tau.ac.il/~simcha/Tacoma-a.mov
Movies – Myth Busters – Breaking a Glass
7765557442856739526%26q%3Dmyth%2Bbuster%2Band%2Bbreaking%2Bglass%26hl%3Den&usg=AL29H230CjxCUfGVnoVfSfHd2cyVxV9mvQ

14. Describe the resultant wave formation when the crests of two waves interfere. What is the name of the phenomenon that
creates this formation?
15. Describe the resultant wave formation when the crests of one waves interferes with the trough of another. What is the name
of the phenomenon that creates this formation?
16. Describe the pattern that forms when two sources create waves. (be specific)
17. Describe what conditions need to be met in order for a glass to shatter only from a noise.
18. Why did the Tacoma Narrows Bridge Collapse (be specific)?
19. What is the relationship between an objects natural frequency and the conditions necessary to create resonance?

Sound
http://www.upscale.utoronto.ca/GeneralInterest/Harrison/Flash/#sound_waves
Reference – Sound and Hearing
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
Animation - Tuning Forks and Longitudinal Waves
http://www.physicsclassroom.com/mmedia/waves/tfl.html
Animation - Sound Waves and the Eardrum
http://www.physicsclassroom.com/mmedia/waves/edl.html
Animation - Standing Waves on a String - 1st Harmonic
http://www.physicsclassroom.com/mmedia/waves/harm1.html
Animation - Standing Waves on a String - 2nd Harmonic
http://www.physicsclassroom.com/mmedia/waves/harm2.html
Animation - Standing Waves on a String - 3rd Harmonic
http://www.physicsclassroom.com/mmedia/waves/harm3.html
Animation - Standing Waves on a String - 4th Harmonic
http://www.physicsclassroom.com/mmedia/waves/harm4.html
Animation - Standing Waves on a String - 5th Harmonic
http://www.physicsclassroom.com/mmedia/waves/harm5.html
Movie – Sound Waves and Doppler Shift
Interactive – The Virtual Flute
http://www.phys.unsw.edu.au/music/flute/virtual/main.html
Movie – Infrasonic Sound Waves
http://dsc.discovery.com/tv/future-weapons/games/cannon/cannon.html

20. Sound Waves are mechanical and longitudinal:
a) Describe what it means to be mechanical.
b) Describe what it means to be longitudinal.
21. Describe the relation ship between harmonic number, nodes and antinodes for a string instrument fixed at both ends.

Doppler Effect
Physlet - Doppler
http://webphysics.davidson.edu/applets/applets.html
Diagrams and Explanations – Behavior of Waves
http://www.physicsclassroom.com/Class/waves/u10l3c.html
Diagrams and Explanations – Doppler Effect
http://www.physicsclassroom.com/Class/waves/U10L3d.html
Video – F14 Tomcat Breaking the Sound Barrier
http://www.brewsterschools.org/brewster/brewsterhigh/plamoreaux/assets/sonicboom.mpg
Movie – Sound Waves and Doppler Shift

22. As the source of sound is moving towards an observer describe the following properties of the perceived sound wave:
a) pitch
b) frequency
c) wavelength
23. As the source of sound is moving away from an observer describe the following properties of the perceived sound wave:
a) pitch
b) frequency
c) wavelength
24. If an object is moving right at the speed of sound, the waves bunch up in the front the moving object.
a) Describe the wave that would result in the front of the moving object.
b) Describe how that sound wave would be perceived.
25. In the video, the white cloud is water vapor not smoke. Why do you suspect that the water vapor condenses at the exact
instant that the plane is crossing the sound barrier?

Beats
Physlet - Sound Out (Select Sound Out from the left menu)
http://webphysics.davidson.edu/applets/java11_Archive.html
Reference and Sound Links – Sound Beats
Explanation and Diagrams - Beats
http://www.saburchill.com/physics/chapters2/0016.html
Physlet – Gizmo – Sound Beats
http://explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=48&
Physlet – Gizmo – Beat and Sine Waves
http://explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=524&
Physlet - Beat
http://library.thinkquest.org/19537/java/Beats.html

26. Describe what is happening when an observer hear the loud portion of a beat.
27. If a frequency of 400 Hz is played, what other frequencies could be used to produce a 3 Hz beat?

Light
Reference – Light and Vision
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
Animation - Propagation of Electromagnetic Waves
http://www.physicsclassroom.com/mmedia/waves/em.html
Physlet – Electromagnetic Waves
http://webphysics.davidson.edu/applets/wave3d/default.html

28. Light Waves are electromagnetic and transverse:
a) Describe what it means to be electromagnetic.
b) Describe what it means to be transverse.
29. In an electromagnetic wave, describe disturbance in the magnetic field relative to the disturbance in the electric field and the
direction that the wave is traveling.

Reflection
Physlet - Billiards and Physics
http://www.phy.ntnu.edu.tw/java/billiards/billiards.html
Animation - Reflection of a Pulse at a Fixed End
http://www.physicsclassroom.com/mmedia/waves/fix.html
Animation - Reflection of a Pulse at a Free End
http://www.physicsclassroom.com/mmedia/waves/free.html
Animation - Reflection: Echo vs. Reverberation
http://www.physicsclassroom.com/mmedia/waves/er.html
Animation - The Law of Reflection
http://www.physicsclassroom.com/mmedia/optics/lr.html
Physlet - Reflection
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=194&
Physlet – Laser Reflection
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=414&
Movie – Reflection and Refraction
Movie - Mirrors
Physlet – Rotation, Reflection, Translation
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=269&

30.   In the “Physlet – Billiards and Physics,” what is the color of the ball that represents the cue ball?
31.   If a wave pulse traveling on a string strikes a fixed endpoint descript the reflection of that pulse.
32.   If a wave pulse traveling on a string comes to a free endpoint descript the reflection of that pulse.
33.   What is the common name for the reflection of a sound wave?
34.   What is the relationship between the angle of incidence and the angle of reflection?
35.   What line are both the angle of incidence and the angle of reflection measured relative to?

Refraction
Physlet - The World Above the Water Surface
http://www.phy.ntnu.edu.tw/java/fishEye/fishEye.html
Animation - Boundary Behavior of Pulses Transmission from a Less Dense to a More Dense Medium
http://www.physicsclassroom.com/mmedia/waves/ltm.html
Animation - The Broken Pencil
http://www.physicsclassroom.com/mmedia/optics/bp.html
Menu - Refraction and the Ray Model of Light
http://www.physicsclassroom.com/Class/refrn/refrntoc.html
Physlet – Snell’s Law
Movie – Reflection and Refraction
Movie – Dispersion of Light and the Electromagnetic Spectrum
Physlet – A Basic Prism
http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=13&
Reference – Refraction
http://online.cctt.org/physicslab/content/Phy1/lessonnotes/refractionoflight/refraction.asp
Physlet – Refraction at a Boundry
http://physics.gac.edu/~chuck/PRENHALL/Chapter%2026/AABXTET0.html

36. When a wave travels from a dense medium to a less dense medium, describe what happens to the waves:
a. Speed
b. Wavelength
c. Frequency
37. When light passes from a less optically dense medium into a more optically dense medium, will it bend towards or away
from the normal?
38. When light passes from a medium with a high index of refraction value into a medium with a low index of refraction value,
will it bend towards or away from the normal?
39. What is a critical angle?
40. What part of you body utilizes refraction right now as you work?

Polarization
Movie and Reference - Polarization of Waves
http://www.regentsprep.org/Regents/physics/phys04/cpolarize/default.htm
Reference: Polarization
http://www.physicsclassroom.com/Class/light/U12L1e.html
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polarcon.html#c1
Physlet - Polarization
http://webphysics.davidson.edu/applets/wave3d/circular.html

41. If a polarizing film is aligned vertically, what alignment of wave would the polarizer eliminate?
42. Describe the light that would penetrate through two polarizing films that were aligned perpendicularly to one another.
43. When sunglasses are made out of polarizing lenses the polarizers are aligned vertically. Why are they constructed in this
manner rather than having the polarizers aligned horizontally?

Optics and Mirrors
Animation - Image Formation for Plane Mirrors
http://www.physicsclassroom.com/mmedia/optics/ifpm.html
http://www.upscale.utoronto.ca/GeneralInterest/Harrison/Flash/#optics

44. On a flat mirror, where does the image form?
45. What is the name for the type of image formed on a flat mirror?
46. What are other properties of the image formed on a flat mirror?

General
Video lectures by Walter Lewin at MIT
http://ocw.mit.edu/OcwWeb/Physics/8-03Fall-2004/CourseHome/index.htm

Interactive Notes
http://www.stmary.ws/physics/home/notes/waves/default.htm

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