Physical Science - Wave Properties of Light.pdf

Physical Science - Wave Properties of Light.pdf

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  BEHAVIOR OF ELECTRONS AND WAVEPROPERTIES OF LIGHT
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  OBJECTIVES At the endof this presentation, you are expected to: 1. cite experimental evidence showing that electrons can behave like waves(S11/12PS-IVg- 64); 2. enumerate the wave properties of light; and 3. differentiate dispersion, scattering, interference, and diffraction (S11/12PSIVh-65)
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  01 Evidences of Wave-Like Behaviorof Electrons
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  Is ELECTRON a PARTICLE or aWAVE?
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  Two famous scientistsin the 1600s, Christiaan Huygens and Isaac Newton were both working on the theories for the behavior of light.
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  Light is a wave. Lightis made up of corpuscles (particles).
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  Light is awave as shown in my double-slit experiment. Thomas Young
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  Constructive interference vs.Destructive interference
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  Constructive interference vs.Destructive interference
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  Light is madeup of particles. Behold! The wave-particle behavior of light. Einstein Photoelectric Effect
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  After the wave- particledual behavior of electron in light was accepted, another scientist took a leap by testing the hypothesis in MATTER.
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  LET’S REVIEW! What isMATTER? Why MATTER matters? What are the parts of an ATOM?
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  Electrons act both as particlesand waves. Modern Double-Slit Experiment
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  Modern Double-Slit Experiment
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  LET’S PONDER! Relate yourselfabout the dual nature of both light and electrons (behave like particles and waves). Was there an instance in your life that you behave like a particle (making an impact to other lives) and a wave (being interfered but not disturbed)? Perform in a creative way (talk show, drama, flash news report, etc.).
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  RUBRICS FOR SCORING 108 6 4 2 Creativity The group performed an outstanding performance showing creativity. The group performed a satisfactory performance showing creativity. The group performed a good performance showing creativity. The group performed a fair performance showing creativity. The group performed a poor performance showing creativity. Unity Unity and understanding is consistently present throughout the performance. Unity and understanding is mostly present throughout the performance. Unity and understanding is present but a member did not participate. Unity and understanding is mostly present throughout the performance. Unity and understanding is poor throughout the performance. Concept The concept of the performance is outstanding. The concept of the performance is satisfactory. The concept of the performance is good. The concept of the performance is fair. The concept of the performance is poor. Confidence Everyone in the group shows excellent confidence. Most of the group shows excellent confidence. Half of the group shows excellent confidence. Less than half of the group shows excellent confidence. None of the group shows excellent confidence.
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  02 Wave Properties of Light
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  PROPERTIES OF LIGHT Thereare 7 basic properties of light: 1. Reflection of light 2. Refraction of light 3. Diffraction of light 4. Interference of light 5. Polarization of light 6. Dispersion of light 7. Scattering of light
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  What property oflight is shown in the pictures? Reflection of light Refraction of light Diffraction of light Interference of light Polarization of light Dispersion of light Scattering of light 1 2 3 4 5 6 7
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  What property oflight is shown in the pictures? 3 Reflection of light 7 Refraction of light 4 Diffraction of light 5 Interference of light 2 Polarization of light 6 Dispersion of light 1 Scattering of light 1 2 3 4 5 6 7
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  Dispersion Interference Diffraction Wave Propertiesof Light Scattering
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  The separation ofvisible light into its different colors (ROYGBIV) is known as dispersion. Dispersion
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  The separation ofvisible light into its different colors (ROYGBIV) is known as dispersion. Dispersion
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  Diffraction is thebending of light around corners such that it spreads out and illuminates areas where a shadow is expected. Diffraction
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  Diffraction is thebending of light around corners such that it spreads out and illuminates areas where a shadow is expected. Diffraction
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  Interference of lightis the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference
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  Interference of lightis the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference
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  Interference Constructive Interference DestructiveInterference
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  Interference Constructive Interference This resultswhen the waves arrive together at a point in phase, that is, crest to crest or trough to trough. The result is a reinforced wave of amplitude equal to the sum of the amplitudes of the two waves.
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  Interference Destructive Interference This resultswhen the waves arrive together at a point 1800 out of phase, that is crest to trough. The resultant wave is of a lesser amplitude equal to the difference of the amplitudes of the individual waves.
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  Interference of lightis the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference
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  Scattering is theprocess in which air molecules absorb sunlight and reemit in various directions. Scattering
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  “Know what sparksthe light in you. Then use that light to illuminate the world.”
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  Various LIGHT Phenomena
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  Theworldissuchamysteriousplacetolive.Icametoberesoundedwithits glorious whispers andgiggles. Applaud to its wondrous works as I walk slowlywithdoubtsinmymind.
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  Why is ourreflection on the concave and convex sides of a spoon looks different? How mirages are formed? Why does light from a red laser passes more easily though red cellophane than green cellophane? Why does clothing of certain colors appear different in artificial light and in sunlight? What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed? Why clouds are usually white and rainclouds dark? Why the sky is blue and sunsets are reddish? S11/12PS-IVh-66
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  Why is ourreflection on the concave and convex sides of a spoon looks different? The shiny spoon is like a mini mirror, but with a curve in it. The front of the spoon is a CONCAVE surface, and the back is a CONVEX surface.
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  A mirage isan optical phenomenon that creates the illusion of water and results from the refraction (bending) of light through a non-uniform medium. Mirages are most commonly observed on sunny days when driving down a roadway. How mirages are formed?
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  Green cellophane willonly allow green light to pass through it. The cellophane absorbs other colors of light. For example, green light will not pass through red cellophane. The green light is absorbed by the red cellophane. However, green light will pass through green cellophane. As a general rule each color filter (e.g. glass or cellophane) will only allow light of its own color to pass through. Why does light from a red laser passes more easily though red cellophane than green cellophane?
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  A halo isa ring of light surrounding the sun or moon. Most halos appear as bright white rings but in some instances, the dispersion of light as it passes through ice crystals found in upper level cirrus clouds can cause a halo to have color. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  Sundogs, also knownas mock suns or "parhelia", are a pair of brightly colored spots, one on either side of the sun. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  What are haloes,sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  Rainbows result fromrefraction of sunlight in falling water droplets plus reflection of the light from the back of the droplet. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  As the dropletsget smaller, red weakens. In fine mist, all colors except violet may disappear. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  The secondary rainbowis about 10° further out from the antisolar point than the primary bow, is about twice as wide, and has its colors reversed. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?
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  Why clouds areusually white and rainclouds dark? Rain clouds scatters more sunlight because they have bigger water droplets. This means that less light from the Sun reaches the bottom of the cloud, giving a gray appearance.
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  Why the skyis blue and sunsets are reddish?
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  Why the skyis blue and sunsets are reddish? When incoming sunlight encounters a heavy concentration of particles in the atmosphere, the shorter wavelengths of light (violet and blue) are scattered away, resulting in a red sunset. Red sunsets are often observed from a beach because of the high concentration of salt particles suspended in the air over the oceans. These particles effectively scatter shorter wavelengths of light, producing red sunsets.
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  FORMATIVE ASSESSMENT
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  1. The bluecolor of the sky is due to: A. selective scattering of visible light by air molecules. B. the filtering effect of water vapor in the earth's atmosphere. C. reflection of sunlight off the earth's oceans. D. transmission of visible light through the ozone layer in the earth's stratosphere.
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  2. Blue skiesoccur during the day due to: A. Diffraction B. Mie scattering C. Rayleigh scattering D. Tyndall Effect
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  3. The followingcorrectly explains light passing through a cellophane except: A. As white light passes through red cellophane, the cellophane absorbs all colors except red. B. Green light can’t easily pass through green cellophane because it shows the same color. C. A red light passing through red cellophane will simply go through since they have the same color. D. Red light can’t easily pass through green cellophane since the cellophane absorbs the red light.
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  4. This sideof the spoon gives you an inverted reflected image. A. Concave B. Convex C. Mirage D. Halo
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  5. What causesa mirage? A. scattering of light by air molecules. B. the bending of light by air of different densities. C. a thin layer of moist air near the ground. D. reflection of light from a hot surface.