Light in Medicine
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Questions and Answers

What is the relationship between light energy and frequency according to Max Planck's equation?

  • E = h / f
  • E = hf (correct)
  • E = f - h
  • E = f / h

    • What happens to the energy of light when its wavelength increases?

  • It increases
  • It remains the same
  • It decreases (correct)
  • It becomes zero

    • What is the sum of reflection, refraction, and absorption of light when it strikes a surface?

  • R + r + A = 1 (correct)
  • R + r + A = 0
  • R + r + A = 2
  • R + r + A = 50%

    • What is the index of refraction?

    <p>The ratio of the speed of light in a vacuum to its speed in a given material</p> Signup and view all the answers

    What is unique about the behavior of light?

    <p>It behaves both as a wave and as a particle</p> Signup and view all the answers

    What happens when a light beam meets a new material at an angle other than perpendicular?

    <p>It is refracted</p> Signup and view all the answers

    What is the primary source of light in the world?

    <p>The sun</p> Signup and view all the answers

    What is the result of a light photon being absorbed in a sensitive cell of the retina?

    <p>A chemical change in the molecule that triggers an electrical signal</p> Signup and view all the answers

    What is the primary use of IR light in medicine?

    <p>To heat tissues and weld detached retinas</p> Signup and view all the answers

    What is the term for the emission of a lower energy light photon when a photon is absorbed?

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

    What is the result of light being absorbed in a material?

    <p>The appearance of heat energy</p> Signup and view all the answers

    What is the difference between diffuse and specular reflection?

    <p>Diffuse reflection occurs from rough surfaces, while specular reflection occurs from smooth surfaces</p> Signup and view all the answers

    What is the term for the scattering of light in many directions?

    <p>Diffuse reflection</p> Signup and view all the answers

    Where is light reflected at an angle equal to the angle at which it strikes the surface?

    <p>Smooth surfaces</p> Signup and view all the answers

    What is the condition in which an excess of bilirubin is excreted by the liver into the blood?

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

    What type of light is used to sterilize medical instruments?

    <p>Ultraviolet light</p> Signup and view all the answers

    What is the result of exposing the skin to UV light from the sun?

    <p>Tanning and sunburn</p> Signup and view all the answers

    What is the benefit of phototherapy in premature infants?

    <p>Reducing bilirubin levels</p> Signup and view all the answers

    What is the energy level of ultraviolet photons compared to visible photons?

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

    What is the result of UV light interacting with the skin?

    <p>Both beneficial and harmful reactions</p> Signup and view all the answers

    What is the year in which phototherapy was discovered to treat jaundice in premature infants?

    <p>1958</p> Signup and view all the answers

    What is the wavelength of light that produces sunburn?

    <p>300 nm</p> Signup and view all the answers

    What happens to the 300 nm light when it passes through ordinary window glass?

    <p>It is absorbed</p> Signup and view all the answers

    What is the major cause of skin cancer in humans?

    <p>UV light</p> Signup and view all the answers

    Where does skin cancer usually appear on the body?

    <p>Portions of the body that have received the most sunlight</p> Signup and view all the answers

    What percentage of the sun's energy is in the IR region?

    <p>About half</p> Signup and view all the answers

    What is the main reason we feel warmth from the sun?

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

    What is the purpose of heat lamps used in physical therapy?

    <p>To produce IR light for heating deep tissues</p> Signup and view all the answers

    What is a characteristic of IR light compared to visible light?

    <p>It penetrates more into tissues</p> Signup and view all the answers

    What is the wavelength range of IR light used in heat lamps?

    <p>1000 to 2000 nm</p> Signup and view all the answers

    UV light with a wavelength of 300 nm can pass through ordinary window glass.

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

    Skin cancer is most common on parts of the body that receive little sunlight.

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

    IR light is better able to heat deep tissues than visible light.

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

    The majority of the sun's energy is in the visible spectrum.

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

    The warmth we feel from the sun is mainly due to UV light.

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

    UV light is the primary cause of skin cancer in humans.

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

    Heat lamps are used to treat skin conditions.

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

    UV light with wavelengths of 1000 to 2000 nm is used in heat lamps.

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

    The sun's energy is primarily composed of visible light.

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

    The DNA in cells is able to absorb visible light.

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

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