Investigation 2.0

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    TECHNOLOGY IN

    SCIENCE

    Sofia Cuevas

    28/04/2014

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    INDEX

    LIGHT P.3

    SOUND P.6

    ENERGY P.9

    SOURCES P.12

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    LIGHT

    An age-old debate that has persisted among scientists is related to the

    question, "Is light a wave or a stream of particles?" Very noteworthy and

    distinguished physicists have taken up each side of the argument, providing a

    wealth of evidence for each side. The fact is that light exhibits behaviors that

    are characteristic of both waves and particles.

    Wave interferenceis a phenomenon that occurs when two waves meet while

    traveling along the same medium. Theinterference of waves causes the

    medium to take on a shape that results from the net effect of the two

    individual waves upon the particles of the medium. Wave interference can be

    constructive or destructive in nature. Constructive interferenceoccurs at anylocation along the medium where the two interfering waves have a

    displacement in the same direction. For example, if at a given instant in time

    and location along the medium, the crest of one wave meets the crest of a

    second wave, they will interfere in such a manner as to produce a "super-

    crest." Similarly, the interference of a trough and a trough interfere

    constructively to produce a "super-trough."Destructive interferenceoccurs

    at any location along the medium where the two interfering waves have a

    displacement in the opposite direction. For example, the interference of a crestwith a trough is an example of destructive interference. Destructive

    interference has the tendency to decrease the resulting amount of displacement

    of the medium.

    Perhaps you have witnessed streaks of color on a car windshield

    shortly after it has been swiped by a windshield wiper or a squeegee at

    a gas station. The momentary streaks of color are the result of

    interference of light by the very thin film of water or soap that remains

    on the windshield. Or perhaps you have witnessed streaks of color in a

    thin film of oil resting upon a water puddle or concrete driveway.

    These streaks of color are the result of the interference of light by the

    very thin film of oil that is spread over the water surface. This form of

    http://www.physicsclassroom.com/Class/waves/u10l3c.cfmhttp://www.physicsclassroom.com/Class/waves/u10l3c.cfm
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    interference is commonly called thin film interferenceand provides

    another line of evidence for the wave behavior of light.

    Einstein, though, is getting ahead of the story. To appreciate how light

    works, we have to put it in its proper historical context. Our first stop isthe ancient world, where some of the earliest scientists and

    philosophers pondered the true nature of this mysterious substance

    that stimulates sight and makes things visible.

    Visible light (commonly referred to simply as light) iselectromagnetic

    radiation that isvisible to thehuman eye,and is responsible for the

    sense ofsight.Visible light is usually defined as having awavelength in

    the range of 400nanometres (nm), or 400109m, to 700 nanometres

    between theinfrared,with longer wavelengths and theultraviolet,

    with shorter wavelengths. These numbers do not represent the

    absolute limits of human vision, but the approximate range within which

    most people can see reasonably well under most circumstances.

    Various sources define visible light as narrowly as 420 to 680 to as

    broadly as 380 to 800 nm. Under ideal laboratory conditions, people

    can see infrared up to at least 1050 nm, children and young adults

    ultraviolet down to about 310 to 313 nm.

    Primary properties of visible light areintensity,propagation

    direction,frequency or wavelengthspectrum,andpolarisation,

    INTESITY

    Inphysics,intensity is thepower transferred per unitarea.In

    theSI system, it has units watts per meter squared (W/m2

    ). It is usedmost frequently withwaves,in which case theaveragepower transfer

    over one period of the wave is used. Intensity can be applied to other

    circumstances where energy is transferred.

    http://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Visual_perceptionhttp://en.wikipedia.org/wiki/Human_eyehttp://en.wikipedia.org/wiki/Visual_perceptionhttp://en.wikipedia.org/wiki/Wavelengthhttp://en.wikipedia.org/wiki/Nanometrehttp://en.wikipedia.org/wiki/Infrared_lighthttp://en.wikipedia.org/wiki/Ultraviolet_lighthttp://en.wikipedia.org/wiki/Intensity_(physics)http://en.wikipedia.org/wiki/Frequencyhttp://en.wikipedia.org/wiki/Wavelengthhttp://en.wikipedia.org/wiki/Spectrumhttp://en.wikipedia.org/wiki/Polarization_(waves)http://en.wikipedia.org/wiki/Physicshttp://en.wikipedia.org/wiki/Power_(physics)http://en.wikipedia.org/wiki/Areahttp://en.wikipedia.org/wiki/SIhttp://en.wikipedia.org/wiki/Wavehttp://en.wikipedia.org/w/index.php?title=Time_averaging&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Time_averaging&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Time_averaging&action=edit&redlink=1http://en.wikipedia.org/wiki/Period_(physics)http://en.wikipedia.org/wiki/Period_(physics)http://en.wikipedia.org/w/index.php?title=Time_averaging&action=edit&redlink=1http://en.wikipedia.org/wiki/Wavehttp://en.wikipedia.org/wiki/SIhttp://en.wikipedia.org/wiki/Areahttp://en.wikipedia.org/wiki/Power_(physics)http://en.wikipedia.org/wiki/Physicshttp://en.wikipedia.org/wiki/Polarization_(waves)http://en.wikipedia.org/wiki/Spectrumhttp://en.wikipedia.org/wiki/Wavelengthhttp://en.wikipedia.org/wiki/Frequencyhttp://en.wikipedia.org/wiki/Intensity_(physics)http://en.wikipedia.org/wiki/Ultraviolet_lighthttp://en.wikipedia.org/wiki/Infrared_lighthttp://en.wikipedia.org/wiki/Nanometrehttp://en.wikipedia.org/wiki/Wavelengthhttp://en.wikipedia.org/wiki/Visual_perceptionhttp://en.wikipedia.org/wiki/Human_eyehttp://en.wikipedia.org/wiki/Visual_perceptionhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Electromagnetic_radiation
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    FRECUENCY

    Frequency is the number of occurrences of a repeating event per

    unittime.It is also referred to as temporal frequency, whichemphasizes the contrast tospatial frequency andangular frequency.

    The period is the duration of onecycle in a repeating event, so the

    period is thereciprocal of the frequency.

    POLARIZATION

    The transverse nature of an electromagnetic wave is quite different from any

    other type of wave. Let's suppose that we use the customary slinky to model

    the behavior of an electromagnetic wave. As an electromagnetic wave

    traveled towards you, then you would observe the vibrations of the slinky

    occurring in more than one plane of vibration. This is quite different than

    what you might notice if you were to look along a slinky and observe a slinky

    wave traveling towards you. Indeed, the coils of the slinky would be vibrating

    back and forth as the slinky approached; yet these vibrations would occur in

    a single plane of space. That is, the coils of the slinky might vibrate up and

    down or left and right. Yet regardless of their direction of vibration, they

    would be moving along the same linear direction as you sighted along the

    slinky.

    http://en.wikipedia.org/wiki/Timehttp://en.wikipedia.org/wiki/Spatial_frequencyhttp://en.wikipedia.org/wiki/Angular_frequencyhttp://en.wikipedia.org/wiki/Turn_(geometry)http://en.wikipedia.org/wiki/Multiplicative_inversehttp://en.wikipedia.org/wiki/Multiplicative_inversehttp://en.wikipedia.org/wiki/Turn_(geometry)http://en.wikipedia.org/wiki/Angular_frequencyhttp://en.wikipedia.org/wiki/Spatial_frequencyhttp://en.wikipedia.org/wiki/Time
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    SOUND

    Sound and music are parts of our everyday sensory experience. Just as humans

    have eyes for the detection of light and color, so we are equipped with ears for the

    detection of sound. We seldom take the time to ponder the characteristics andbehaviors of sound and the mechanisms by which sounds are produced,

    propagated, and detected. The basis for an understanding of sound, music and

    hearing is the physics of waves. Sound is a wave that is created by vibrating

    objects and propagated through a medium from one location to another. In this

    unit, we will investigate the nature, properties and behaviors of sound waves and

    apply basic wave principles towards an understanding of music.

    ACOUSTICS

    Acoustics is the interdisciplinary science that deals with the study of allmechanical waves in gases, liquids, and solids including vibration, sound,

    ultrasound and infrasound. A scientist who works in the field ofacoustics is

    an acoustician while someone working in the field ofacoustical

    engineering may be called an acoustical engineer. (Not to be confused with

    anaudio engineer.) The application of acoustics can be seen in almost all

    aspects of modern society, sub disciplines include:aero acoustics,audio

    signal processing,architectural acoustics,bioacoustics,electro

    acoustics,environmental noise,musical acoustics,noise

    control,psychoacoustics,speech,ultrasound, underwaterandvibration.

    PROPAGATION OF SOUND

    Sound propagates through compressible media such as air, water and solids

    as longitudinal waves and also as a transverse waves in solids. The sound

    waves are generated by a sound source, such as the vibrating diaphragm of

    http://en.wikipedia.org/wiki/Acousticshttp://en.wikipedia.org/wiki/Acousticshttp://en.wikipedia.org/wiki/Acoustical_engineeringhttp://en.wikipedia.org/wiki/Acoustical_engineeringhttp://en.wikipedia.org/wiki/Audio_engineerhttp://en.wikipedia.org/wiki/Aeroacousticshttp://en.wikipedia.org/wiki/Audio_signal_processinghttp://en.wikipedia.org/wiki/Audio_signal_processinghttp://en.wikipedia.org/wiki/Architectural_acousticshttp://en.wikipedia.org/wiki/Bioacousticshttp://en.wikipedia.org/wiki/Environmental_noisehttp://en.wikipedia.org/wiki/Musical_acousticshttp://en.wikipedia.org/wiki/Noise_controlhttp://en.wikipedia.org/wiki/Noise_controlhttp://en.wikipedia.org/wiki/Psychoacousticshttp://en.wikipedia.org/wiki/Speechhttp://en.wikipedia.org/wiki/Vibrationhttp://en.wikipedia.org/wiki/Vibrationhttp://en.wikipedia.org/wiki/Speechhttp://en.wikipedia.org/wiki/Psychoacousticshttp://en.wikipedia.org/wiki/Noise_controlhttp://en.wikipedia.org/wiki/Noise_controlhttp://en.wikipedia.org/wiki/Musical_acousticshttp://en.wikipedia.org/wiki/Environmental_noisehttp://en.wikipedia.org/wiki/Bioacousticshttp://en.wikipedia.org/wiki/Architectural_acousticshttp://en.wikipedia.org/wiki/Audio_signal_processinghttp://en.wikipedia.org/wiki/Audio_signal_processinghttp://en.wikipedia.org/wiki/Aeroacousticshttp://en.wikipedia.org/wiki/Audio_engineerhttp://en.wikipedia.org/wiki/Acoustical_engineeringhttp://en.wikipedia.org/wiki/Acoustical_engineeringhttp://en.wikipedia.org/wiki/Acousticshttp://en.wikipedia.org/wiki/Acoustics
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    a stereo speaker. The sound source creates vibrations in the surrounding

    medium. As the source continues to vibrate the medium, the vibrations

    propagate away from the source at the speed of sound, thus forming the

    sound wave. At a fixed distance from the source, the pressure, velocity, anddisplacement of the medium vary in time. At an instant in time, the pressure,

    velocity, and displacement vary in space. Note that the particles of the

    medium do not travel with the sound wave. This is intuitively obvious for a

    solid, and the sameis true for liquids and gases (that is, the vibrations of

    particles in the gas or liquid transport the vibrations, while

    the averageposition of the particles over time do not change). During

    propagation, waves can bereflected,refracted,orattenuated by the

    medium.

    The behavior of sound propagation is generally affected by three things:

    A relationship betweendensity and pressure. This relationship, affected

    by temperature, determines the speed of sound within the medium.

    The propagation is also affected by the motion of the medium itself. For

    example, sound moving through wind. Independent of the motion of

    sound through the medium, if the medium is moving, the sound is further

    transported.

    The viscosity of the medium also affects the motion of sound waves. It

    determines the rate at which sound is attenuated. For many media, such

    as air or water, attenuation due to viscosity is negligible.

    http://en.wikipedia.org/wiki/Reflection_(physics)http://en.wikipedia.org/wiki/Refractionhttp://en.wikipedia.org/wiki/Attenuationhttp://en.wikipedia.org/wiki/Densityhttp://en.wikipedia.org/wiki/Densityhttp://en.wikipedia.org/wiki/Attenuationhttp://en.wikipedia.org/wiki/Refractionhttp://en.wikipedia.org/wiki/Reflection_(physics)
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    ENERGY

    Inphysics,energy is aproperty ofobjects,transferable among them

    viafundamental interactions,which can beconverted inform butnot

    created or destroyed.Thejoule is theSI unit of energy, based on the

    amount transferred to an object by themechanical work of moving it

    1meteragainst aforce of 1newton.

    Work andheat are two categories of processes or mechanisms that

    can transfer a given amount of energy. Thesecond law of

    thermodynamics limits the amount of work that can be performed by

    energy that is obtained via a heating processsome energy is always

    lost aswaste heat.The maximum amount that can go into work is

    called theavailable energy.Systems such as machines and living

    things often require available energy, not just any energy. Mechanical

    and other forms of energy can be transformed in the other direction

    intothermal energy without such limitations.

    There are manyforms of energy,but all these types must meet certain

    conditions such as being convertible to other kinds of energy, obeying

    conservation of energy, and causing a proportional change in mass in

    objects that possess it. Common energy forms include thekinetic

    energy of a moving object, theradiant energy carried by light and

    otherelectromagnetic radiation,thepotential energy stored by virtue of

    the position of an object in a forcefield such as

    agravitational,electric ormagnetic field,and thethermal

    energy comprising the microscopic kinetic and potential energies of the

    disordered motions of the particles making up matter. Some specific

    forms of potential energy includeelastic energy due to the stretching or

    deformation of solid objects andchemical energy such as is released

    when a fuel burns. Any object that has mass when stationary, such as

    a piece of ordinary matter, is said to haverest mass,or

    http://en.wikipedia.org/wiki/Physicshttp://en.wikipedia.org/wiki/Physical_propertyhttp://en.wikipedia.org/wiki/Physical_objecthttp://en.wikipedia.org/wiki/Energy_transferhttp://en.wikipedia.org/wiki/Fundamental_interactionhttp://en.wikipedia.org/wiki/Energy_transformationhttp://en.wikipedia.org/wiki/Forms_of_energyhttp://en.wikipedia.org/wiki/Conservation_of_energyhttp://en.wikipedia.org/wiki/Conservation_of_energyhttp://en.wikipedia.org/wiki/Joulehttp://en.wikipedia.org/wiki/SIhttp://en.wikipedia.org/wiki/Mechanical_workhttp://en.wikipedia.org/wiki/Metrehttp://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Newton_(unit)http://en.wikipedia.org/wiki/Work_(thermodynamics)http://en.wikipedia.org/wiki/Heathttp://en.wikipedia.org/wiki/Second_law_of_thermodynamicshttp://en.wikipedia.org/wiki/Second_law_of_thermodynamicshttp://en.wikipedia.org/wiki/Waste_heathttp://en.wikipedia.org/wiki/Available_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Forms_of_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Radiant_energyhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Potential_energyhttp://en.wikipedia.org/wiki/Classical_field_theoryhttp://en.wikipedia.org/wiki/Gravitational_fieldhttp://en.wikipedia.org/wiki/Electric_fieldhttp://en.wikipedia.org/wiki/Magnetic_fieldhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Elastic_energyhttp://en.wikipedia.org/wiki/Chemical_energyhttp://en.wikipedia.org/wiki/Rest_masshttp://en.wikipedia.org/wiki/Rest_masshttp://en.wikipedia.org/wiki/Chemical_energyhttp://en.wikipedia.org/wiki/Elastic_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Magnetic_fieldhttp://en.wikipedia.org/wiki/Electric_fieldhttp://en.wikipedia.org/wiki/Gravitational_fieldhttp://en.wikipedia.org/wiki/Classical_field_theoryhttp://en.wikipedia.org/wiki/Potential_energyhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Radiant_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Forms_of_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Available_energyhttp://en.wikipedia.org/wiki/Waste_heathttp://en.wikipedia.org/wiki/Second_law_of_thermodynamicshttp://en.wikipedia.org/wiki/Second_law_of_thermodynamicshttp://en.wikipedia.org/wiki/Heathttp://en.wikipedia.org/wiki/Work_(thermodynamics)http://en.wikipedia.org/wiki/Newton_(unit)http://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Metrehttp://en.wikipedia.org/wiki/Mechanical_workhttp://en.wikipedia.org/wiki/SIhttp://en.wikipedia.org/wiki/Joulehttp://en.wikipedia.org/wiki/Conservation_of_energyhttp://en.wikipedia.org/wiki/Conservation_of_energyhttp://en.wikipedia.org/wiki/Forms_of_energyhttp://en.wikipedia.org/wiki/Energy_transformationhttp://en.wikipedia.org/wiki/Fundamental_interactionhttp://en.wikipedia.org/wiki/Energy_transferhttp://en.wikipedia.org/wiki/Physical_objecthttp://en.wikipedia.org/wiki/Physical_propertyhttp://en.wikipedia.org/wiki/Physics
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    anequivalent amount of energy whose form is calledrest energy,

    though this isn't immediately apparent in everyday phenomena

    described byclassical physics.

    ENERGY TRANSFORMATION

    Energy may betransformed between different forms at variousefficiencies.

    Items that transform between these forms are calledtransducers.

    Energy transformations in the universe over time are characterized by

    various kinds of potential energy that has been available since theBig Bang,

    later being "released" (transformed to more active types of energy such as

    kinetic or radiant energy), when a triggering mechanism is available. Familiar

    examples of such processes include nuclear decay, in which energy is

    released that was originally "stored" in heavy isotopes (such

    asuranium andthorium), bynucleosynthesis,a process ultimately using the

    gravitational potential energy released from thegravitational

    collapse ofsupernovae,to store energy in the creation of these heavy

    elements before they were incorporated into the solar system and the Earth.

    This energy is triggered and released in nuclearfission bombs or in civil

    nuclear power generation. Similarly, in the case of achemical

    explosion,chemical potential energy is transformed tokinetic

    energy andthermal energy in a very short time. Yet another example is that

    of apendulum.At its highest points thekinetic energy is zero and the

    gravitationalis at maximum. At its lowest point thekinetic energy is at

    maximum and is equal to the decrease ofpotential energy.If one

    (unrealistically) assumes that there is nofriction or other losses, the

    conversion of energy between these processes would be perfect, and

    thependulum would continue swinging forever.

    http://en.wikipedia.org/wiki/Mass-energy_equivalencehttp://en.wikipedia.org/wiki/Rest_mass#Rest_energyhttp://en.wikipedia.org/wiki/Classical_physicshttp://en.wikipedia.org/wiki/Energy_transformationhttp://en.wikipedia.org/wiki/Energy_conversion_efficiencyhttp://en.wikipedia.org/wiki/Transducerhttp://en.wikipedia.org/wiki/Big_Banghttp://en.wikipedia.org/wiki/Uraniumhttp://en.wikipedia.org/wiki/Thoriumhttp://en.wikipedia.org/wiki/Nucleosynthesishttp://en.wikipedia.org/wiki/Gravitational_collapsehttp://en.wikipedia.org/wiki/Gravitational_collapsehttp://en.wikipedia.org/wiki/Supernovahttp://en.wikipedia.org/wiki/Fission_bombhttp://en.wikipedia.org/wiki/Chemical_explosivehttp://en.wikipedia.org/wiki/Chemical_explosivehttp://en.wikipedia.org/wiki/Chemical_potentialhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Pendulumhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Potential_energyhttp://en.wikipedia.org/wiki/Frictionhttp://en.wikipedia.org/wiki/Pendulumhttp://en.wikipedia.org/wiki/Pendulumhttp://en.wikipedia.org/wiki/Frictionhttp://en.wikipedia.org/wiki/Potential_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Pendulumhttp://en.wikipedia.org/wiki/Thermal_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Kinetic_energyhttp://en.wikipedia.org/wiki/Chemical_potentialhttp://en.wikipedia.org/wiki/Chemical_explosivehttp://en.wikipedia.org/wiki/Chemical_explosivehttp://en.wikipedia.org/wiki/Fission_bombhttp://en.wikipedia.org/wiki/Supernovahttp://en.wikipedia.org/wiki/Gravitational_collapsehttp://en.wikipedia.org/wiki/Gravitational_collapsehttp://en.wikipedia.org/wiki/Nucleosynthesishttp://en.wikipedia.org/wiki/Thoriumhttp://en.wikipedia.org/wiki/Uraniumhttp://en.wikipedia.org/wiki/Big_Banghttp://en.wikipedia.org/wiki/Transducerhttp://en.wikipedia.org/wiki/Energy_conversion_efficiencyhttp://en.wikipedia.org/wiki/Energy_transformationhttp://en.wikipedia.org/wiki/Classical_physicshttp://en.wikipedia.org/wiki/Rest_mass#Rest_energyhttp://en.wikipedia.org/wiki/Mass-energy_equivalence
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    SOURCES

    http://science.howstuffworks.com/light.htm

    http://en.wikipedia.org/wiki/Light

    http://en.wikipedia.org/wiki/Sound http://en.wikipedia.org/wiki/Energy#Transformation

    http://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-

    Interference

    http://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-

    Source-Interference

    http://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-

    Behaviors-of-Light

    http://www.physicsclassroom.com/class/light

    http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-is-a-Mechanical-Wave

    http://science.howstuffworks.com/light.htmhttp://science.howstuffworks.com/light.htmhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Soundhttp://en.wikipedia.org/wiki/Soundhttp://en.wikipedia.org/wiki/Energy#Transformationhttp://en.wikipedia.org/wiki/Energy#Transformationhttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/lighthttp://www.physicsclassroom.com/class/lighthttp://www.physicsclassroom.com/class/lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Wavelike-Behaviors-of-Lighthttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Two-Point-Source-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://www.physicsclassroom.com/class/light/Lesson-1/Thin-Film-Interferencehttp://en.wikipedia.org/wiki/Energy#Transformationhttp://en.wikipedia.org/wiki/Soundhttp://en.wikipedia.org/wiki/Lighthttp://science.howstuffworks.com/light.htm