infrared radiation

• every object absorbs and emits...

  infrared radiation
• infrared radiation


  a form of energy with wavelengths that are longer than visible light
• the hotter an object is, the ... infrared radiation it radiates in a given time

  more
• an object that is hotter than its surroundings ... more IR radiation than it absorbs as it cools down

  emits
• an object that is cooler than its surroundings ...more IR radiation than it emits as it warms up

  absorbs
• objects at a constant temperature...


  emit IR radiation at the same rate as they are absorbing it
• some colours and surfaces absorb and emits radiation...


  better than others
• does a black or white coloured object absorb/emit radiation better?


  black
• does an object with a matte or shiny surface absorb/emit radiation better?


  matte
• leslie cube


  investigates emission with different coloured and textured sides
• black bodies are the...

  ultimate emitters
• black body radiation


  the radiation emitted by a perfect black body
• a perfect black body is...

  an object that absorbs all of the radiation that hits it, with none being reflected or transmitted
• all objects emit electromagnetic radiation due to...

  the energy in their thermal energy stores
• the intensity and distribution of the wavelengths emitted by an object depend on...

  the objects temperature
• as the temperature of an object increases, the ... of every emitted wavelength increases

  intensity
• the higher the frequency, the ... the wavelength


  shorter
• as a body gets hotter, it emits more...

  high frequency electromagnetic radiation than low frequency
• relationship between intensity and wavelength graph

  
• radiation affects...


  the Earth's temperature
• during the day, ... radiation is transferred to the Earth from the sun and absorbed


  more
• how does the Earth absorbing radiation from the sun affect the temperature?


  the temperature increases
• at night, ... radiation is being absorbed than emitted


  less
• how does the Earth emitting more radiation than absorbing affect the temperature?


  the temperature decreases
• radiation for Earth diagram

  
• changes to the atmosphere can cause a change to Earth's overall...

  temperature
• if the atmosphere starts to absorb more radiation without emitting the same amount

  the overall temperature will rise until absorption and emission are equal again