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Properties of Light and Its Impact on Human Health
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Properties of Light and Its Impact on Human Health

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@ToughTiger

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Questions and Answers

What is the major source of light in the world?

  • Artificial light
  • Laser beams
  • Fluorescent light
  • The sun (correct)
  • What happens when a light beam meets a new material at an angle other than perpendicular?

  • It disappears
  • It is reflected
  • It is absorbed
  • It bends, or is refracted (correct)
  • What happens when a light photon is absorbed by a single molecule?

  • It is reflected
  • Its energy is used in various ways (correct)
  • It disappears
  • It is emitted
  • What is the property of light that allows it to be focused?

    <p>Diffraction</p> Signup and view all the answers

    What is the term for the ratio of the speed of light in a vacuum to its speed in a given material?

    <p>Index of refraction</p> Signup and view all the answers

    What is the basis of the use of IR light in medicine?

    <p>Its energy appears as heat</p> Signup and view all the answers

    What is the term for when a lower energy light photon is emitted after a photon is absorbed?

    <p>Fluorescence</p> Signup and view all the answers

    What is the energy of a photon used for when it is absorbed by a molecule?

    <p>To cause a chemical change</p> Signup and view all the answers

    What is the property of light that allows it to bend when passing from one material to another?

    <p>Refraction</p> Signup and view all the answers

    What can happen to the energy of a photon when it is absorbed by a molecule?

    <p>It is used to cause a chemical change</p> Signup and view all the answers

    What is the term for the behavior of light where it acts as both a wave and a particle?

    <p>Wave-particle duality</p> Signup and view all the answers

    What is the medical use of the heat produced by laser beams?

    <p>To coagulate small blood vessels in the retina</p> Signup and view all the answers

    What is the purpose of the chemical change caused by the absorption of a light photon in the retina?

    <p>To trigger an electrical signal to the brain</p> Signup and view all the answers

    What is the medical application of the property of light where its energy is used to heat tissues?

    <p>IR light therapy</p> Signup and view all the answers

    What is the behavior of light that is the basis of fluorescent light bulbs?

    <p>Fluorescence</p> Signup and view all the answers

    How does the energy of a photon change when it is absorbed by a molecule?

    <p>It is transferred to the molecule</p> Signup and view all the answers

    Study Notes

    Light Properties

    • The speed of light changes when it passes from one material to another, and this property is described by the index of refraction.
    • When light meets a new material at an angle, it bends or is refracted, allowing it to be focused and enabling us to read and see objects clearly.

    Wave-Particle Duality

    • Light behaves as both a wave and a particle, exhibiting different properties depending on the situation.
    • As a wave, light produces interference and diffraction, which are of minor importance in medicine.
    • As a particle (photon), light can be absorbed by a single molecule, causing a chemical change and potentially an electrical signal.

    Light Absorption and Energy

    • When light is absorbed, its energy is often converted into heat, which is the basis for the medical use of IR light to heat tissues.
    • The heat produced by laser beams is used to "weld" a detached retina to the back of the eyeball and to coagulate small blood vessels in the retina.

    Fluorescence

    • When a photon is absorbed, a lower energy light photon is sometimes emitted, a process known as fluorescence.
    • Fluorescence is the basis for the fluorescent light bulb, and certain materials exhibit this property.

    Light Properties

    • The speed of light changes when it passes from one material to another, and this property is described by the index of refraction.
    • When light meets a new material at an angle, it bends or is refracted, allowing it to be focused and enabling us to read and see objects clearly.

    Wave-Particle Duality

    • Light behaves as both a wave and a particle, exhibiting different properties depending on the situation.
    • As a wave, light produces interference and diffraction, which are of minor importance in medicine.
    • As a particle (photon), light can be absorbed by a single molecule, causing a chemical change and potentially an electrical signal.

    Light Absorption and Energy

    • When light is absorbed, its energy is often converted into heat, which is the basis for the medical use of IR light to heat tissues.
    • The heat produced by laser beams is used to "weld" a detached retina to the back of the eyeball and to coagulate small blood vessels in the retina.

    Fluorescence

    • When a photon is absorbed, a lower energy light photon is sometimes emitted, a process known as fluorescence.
    • Fluorescence is the basis for the fluorescent light bulb, and certain materials exhibit this property.

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    Description

    This quiz explores the interesting properties of light, its impact on human health, and its applications in medicine. Learn about the speed of light, refraction, and more.

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