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Ch 18-2 Electromagnetic Spectrum
Waves of the Spectrum
• Waves beyond the visible red end of the color band
  is called infrared radiation.
• The full range of frequencies is the electromagnetic
  spectrum.
• The spectrum includes many types of waves
Radio Waves
• They are used in radio, television, radar and
  microwave ovens.
• Radios use 2 ways Amplitude modulation and
  frequency modulation.
• Microwaves are shortest radio waves (1m – 1mm)
• Used in cell phones and to cook food
• Radar is used to determine location and
 speed of objects
Other rays


• Infrared rays - have lower frequencies than light
  (1mm – 750nm) it is used to discover areas of heat
  differences.
• Visible Light – helps people to see and use colors.
• Ultraviolet rays – higher frequency than light, it is
  used in medicine and agriculture. Helps your body
  produce Vitamin D. Lamps made to mimic the sun
Other Rays


• X – Rays – high frequency and high energy
  which can penetrate matter that light cannot.
  It is used to take pictures of solid objects.
• Gamma Rays – the shortest wavelengths
  and highest frequencies in the spectrum so
  they have the most energy. Used to kill
  cancer cells, take pics of the brain it is
  dangerous to people if over exposed.

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Ch 18 2 electromagnetic spectrum

  • 2. Waves of the Spectrum • Waves beyond the visible red end of the color band is called infrared radiation. • The full range of frequencies is the electromagnetic spectrum. • The spectrum includes many types of waves
  • 3. Radio Waves • They are used in radio, television, radar and microwave ovens. • Radios use 2 ways Amplitude modulation and frequency modulation. • Microwaves are shortest radio waves (1m – 1mm) • Used in cell phones and to cook food • Radar is used to determine location and speed of objects
  • 4. Other rays • Infrared rays - have lower frequencies than light (1mm – 750nm) it is used to discover areas of heat differences. • Visible Light – helps people to see and use colors. • Ultraviolet rays – higher frequency than light, it is used in medicine and agriculture. Helps your body produce Vitamin D. Lamps made to mimic the sun
  • 5. Other Rays • X – Rays – high frequency and high energy which can penetrate matter that light cannot. It is used to take pictures of solid objects. • Gamma Rays – the shortest wavelengths and highest frequencies in the spectrum so they have the most energy. Used to kill cancer cells, take pics of the brain it is dangerous to people if over exposed.