Uses and Dangers of EM Waves

• What do electrons oscillate to produce?

  Radio waves
• What is supplied to produce radio waves?

  Alternating current
• How are emitted radio waves transferred?

  They cause the receiver to oscillate
• What happens when a receiver absorbs current of the same frequency as radio waves?

  It induces oscillation in the receiver
• What are some uses of electromagnetic (EM) waves?

  • Radio waves: TV, Radio
  • Microwaves: Cooking
  • Infrared radiation: Electric heaters, Infrared cameras
  • X-rays and gamma rays: Medical imaging, Medical treatments
  • UV waves: Sun tan beds, Energy efficient lights
  • Satellite communications
• What is a radiation dose?

  Measure of risk of harm to body tissues
• How is radiation dose measured?

  In sieverts
• What factors affect the risk of harm from radiation exposure?

  Size of dose and type of radiation
• What is 1 sievert (Sv) equal to in millisieverts (mSv)?

  1000 millisieverts
• What harmful effect can UV radiation have on the skin?

  Can prematurely age skin
• What is a risk associated with X-rays and gamma rays?

  Gene mutation and cancer
• How does the harmful effect of UV radiation differ from that of X-rays and gamma rays?

  UV causes skin aging, X-rays cause gene mutation