PHYSICS

• Transverse waves without a medium and they can travel through empty space.


  Electromagnetic Waves
• Electromagnetic waves travel ____ – around 300,000 kilometres per second (the speed of light).

  very fast
• The name given to a GROUP OF ENERGY waves that are mostly invisible and can travel through empty space

  electromagnetic spectrum
• name for the range of electromagnetic waves when placed in order of increasing frequency

  electromagnetic spectrum
• •Have the longest wavelengths and lowest frequencies of all the electromagnetic waves.

  radio waves
• measure the time it takes a radio wave to travel from several satellites to the receiver, determining the distance to each satellite.

  Global Positioning Systems
• A radio picks up radio waves through an antenna and converts it to? 

  sound waves
• •Have shorter wavelengths and the highest frequency THAN RADIOWAVES

  microwaves
• 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.

  RADAR
• •below red and shorter wavelength and higher frequency THAN MICROWAVES.

  infrared
• —a picture that shows regions of different temperatures in the body. Temperatures are calculated by the amount of infrared radiation given off.  

  Thermogram
• •Shorter wavelength and higher frequency than infrared rays and electromagnetic waves we can see.

  visible lights
• •Shorter wavelength and higher frequency than visible ligh and CARRY MORE ENERGY than visible light

  ultraviolet rays
• Shorter wavelength and higher frequency than UV-rays. Carry a great amount of energy. Can penetrate most matter.

  x-rays
• Shorter wavelength and higher frequency than X-rays Carry the GREATEST AMOUNT OF ENERGY  and penetrate the most.

  gammarays
• Used in radiation treatment to kill cancer cells. Can be very harmful if not used correctly.

  gamma rays
• •All electromagnetic waves travel at the same speed.  (_____) in a vacuum.

  300,000,000 m/s
• •They all have different _____ and different ____.

  wavelengths and frequencies
• DEVICE that STORE electric chargers and consist of 2 plates

  capacitor
• capacitor are separated by

  insulator
• can neither be a vacuum or an electric insulators

  non conductive region
• symbol of capacitor

  -| |-
• types of capacitor

  parallel plate capacitor and cylindrical capacitor
• ABILITY to store charge

  capacitance
• unit of capacitance


  Farad
• formula of capacitance


  C=Q/V
• a capacitor can be___ by connecting it to any closed circuit that allows current that allows current to flow

  discharged
• The abilityof a capacitor to store charge is called


  capacitance
• uses of capacitor

  batteries, sensing devices, separate ac & dc, vehicle audio system