SCIENCE B

• The electromagnetic spectrum is the complete spectrum (continuum) of all forms of light.
• An electromagnetic wave consists of electric and magnetic fields which vibrate, thus making waves.
• Electromagnetic waves travel very fast– around 300km/sec (the speed of light).
• Wavelength gets shorter as as frequency increases
• Longest wavelength is the radio waves, shortest wavelength gamma rays
• Properties of electromagnetic waves include speed, frequency, and wavelength.
• FORMULA: S = F X 𝜆
• • All parts of the electromagnetic spectrum travel at the same speed
• • Wavelength and frequency have an indirect relationship
• • If wavelength increases, then frequency decreases
• • If frequency increases, then wavelength decreases
• RADIO WAVES

  • Low energy, low frequence waves with longest wavelengths
• Radio waves include FM, AM, radar and TV waves.
• Radio waves Includes wavelength of 1 m (10-1) and longer
• Radio waves is used in many devices such as remote control items, cellphones, and wireless devices.
• GLOBAL POSITIONING SYSTEMS (GPS)

  • Measure the time it takes radio waves to travel from several satellites to the receiver, determining the distance to each satelli
• A radio picks up radio waves through an antenna and converts it to sound waves.
• Each radio station in an are broadcasts at a different frequency
• MAGNETIC RESONANCE IMAGING (MRI)

  • Uses short wave radio waves with a magnet to create an image
• MICROWAVES

  • Have shorter wavelength and higher frequency than radio waves
• MICROWAVES

  • Used for communication, medicine, and consumer use (microwave ovens)
• MICROWAVES

  • Waves transfer energy to the water in the food causing them to vibrate which in turn transfers energy in the form of heat to the food.
• RADAR (Radio Detection and Ranging)

  • Used to find the speed of an object by sending out radio waves and measuring the time it takes them to return. 
• INFRARED WAVES

  • Invisible em waves that are detected as heat
• INFRARED WAVES

  • Can be detected with special devices such as night goggles
• INFRARED WAVES

  • Used in heat lamps
• INFRARED WAVES

  • Higher energy than microwaves but lower energy than visible light.
• THERMOGRAM

  • A picture that shows regions of different temperatures in the body
• Temperatures are calculated by the amount of infrared radiation given off.
• PEOPLE GIVE OFF INFRARED RAYS
• VISIBLE LIGHT

  • The portion of the EM spectrum that the human eyes can detect
• VISIBLE LIGHT

  • RED HAS THE LOWEST FREQUENCY 
• VISIBLE LIGHT

  • When light enters a new medium it bends (refracts). Each wavelength bends a different amount, allotting white light to separate into various colors- ROYGBIV
• ULTRAVIOLET WAVES

  • Higher energy waves than light waves
• ULTRAVIOLET WAVES

  • Can cause skin cancer and blindness to humans
• ULTRAVIOLET WAVES

  • Used in tanning beds and sterilizing equipment
• ULTRAVIOLET WAVES

  • USED TO KILL BACTERIA
• • Too much of UV Rays can cause skin cancer, use sun block
• ULTRAVIOLET WAVES

  • Causes skin to produce Vitamin D- Which is good for the teeth and bones
• X-RAYS

  • High energy waves
  • Used in medicine, astronomy, and industry
  • Can cause cancer