Understanding Ultraviolet Radiation
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Questions and Answers

How is ultraviolet radiation classified based on the interaction with biological materials?

  • UVA, UVB, UVC (correct)
  • Near, middle, far, extreme
  • Black light, effects on organisms, atomic excitation
  • Visible light, X-ray, fluorescence

    • What forms the ozone layer in the lower stratosphere?

  • Carbon dioxide
  • Nitrogen
  • Oxygen (correct)
  • Argon

    • Which division of ultraviolet radiation is responsible for its best-known effects on organisms?

  • UVB (correct)
  • UVA
  • Far region
  • UVC

    • How is ultraviolet radiation produced by high-temperature surfaces like the Sun?

    <p>As a continuous spectrum</p> Signup and view all the answers

    Which region of ultraviolet radiation does not reach Earth's surface?

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

    How does ultraviolet radiation interact with certain materials to cause fluorescence?

    <p>By emitting visible light</p> Signup and view all the answers

    What is the primary mechanism by which ultraviolet radiation causes skin cancer?

    <p>Ultraviolet radiation causes direct damage to the DNA of skin cells, leading to mutations that can cause cancer.</p> Signup and view all the answers

    Which of the following is NOT a positive effect of ultraviolet radiation on the human body?

    <p>Causing the skin to become thicker and more wrinkled, which can protect against skin cancer</p> Signup and view all the answers

    What is the primary purpose of using ultraviolet radiation in fluorescent lamps?

    <p>To interact with phosphors that emit visible light</p> Signup and view all the answers

    What is the typical wavelength range of infrared radiation?

    <p>700 nanometers to 1 millimeter</p> Signup and view all the answers

    What is the primary source of thermal radiation emitted by objects near room temperature?

    <p>Infrared radiation</p> Signup and view all the answers

    Which of the following is a unique property of infrared radiation compared to other types of electromagnetic radiation?

    <p>It is undetectable by the human eye.</p> Signup and view all the answers

    Which of the following is the primary reason for the increased hazardous effects of UVB radiation on organisms when the ozone layer becomes thin?

    <p>UVB radiation reaches the Earth's surface in higher amounts</p> Signup and view all the answers

    What is the primary mechanism by which melanin helps protect the skin from the harmful effects of ultraviolet radiation?

    <p>Melanin absorbs ultraviolet radiation and limits its penetration into tissues</p> Signup and view all the answers

    Which of the following is the most direct consequence of severe ultraviolet sunburns on the human body?

    <p>Blisters, swelling, seepage of fluid, and sloughing of the outer skin</p> Signup and view all the answers

    What is the primary reason why persons of light complexion experience the harmful effects of ultraviolet radiation to a greater degree?

    <p>They have less melanin pigment in their skin</p> Signup and view all the answers

    What is the primary function of the blood capillaries in the skin when it is exposed to ultraviolet radiation?

    <p>To dilate and aggregate red and white blood cells</p> Signup and view all the answers

    What is the primary purpose of the tanning response in the skin when exposed to ultraviolet radiation?

    <p>To activate melanin pigments and migrate them to the surface of the skin</p> Signup and view all the answers

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