Radiation

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Radiation is the emission or transmission of energy in a straight line (like a 'ray' in geometry'). This line travels through space or some material, spreading out from the source in all directions; "radiating" out. Radiation can also refer to the emitted energy itself. There are many different types of radiation that can include electromagnetic, thermal, acoustic, particle radiation (such as alpha or beta radiation from a radioactive source), and ionizing radiation.

Electromagnetic Radiation
Electromagnetic radiation is produced by accelerating charges and moves through space as with its electric and magnetic fields oscillating. This radiation is also known as an electromagnetic wave as it is composed of alternating electric and magnetic fields. This type of radiation comes in discrete packets known as photons.

There are several different types of electromagnetic radiation, and their properties depend on their energy and wavelength. Some of the different types include radio waves, infrared radiation (felt as heat), microwaves, visible light, ultraviolet radiation, x-rays, gamma rays, and cosmic rays.

Long wavelength electromagnetic radiation (radio to visible light waves) are generally non-ionizing. Shorter wavelength electromagnetic radiation (ultraviolet light to gamma rays) tends to be ionizing.
  1. What do you call the emission or transmission of energy in a straight line?
  2. What type of radiation is produced by accelerating charges and moves through space as with its electric and magnetic fields oscillating?
  3. What is the other term for electromagnetic radiation?
  4. Which of the following is not a type of electromagnetic radiation?
  5. Which of the following electromagnetic radiation is ionizing?
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  1. Does radiation from phones fall under electromagnetic radiation? Explain your answer.
  2. Is radiation totally bad? Support your answer.
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    Vocabulario

      • of or relating to sound or to the sense of hearing
      • the act of producing or sending out something (such as energy or gas) from a source
      • a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions
      • something (such as a message or broadcast) that is transmitted to a radio, television, etc.
      • the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave

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