infrared Flashcards
what is infrared radiation given out by
all hot objects
the hotter the object …
the more IR radiation it gives out
how is IR radiation used in thermal imaging
camera detects the IR radiation and turns it into an electrical signal which is displayed
different colours represent different amounts of IR radiation being detected
used by police to find suspects trying to escape in the dark
how do infrared sensors work
a change in IR radiation sounds an alarm or turns on a security light
how do infrared sensors used
a change in IR radiation sounds an alarm or turns on an security light
how does IR radiation cause food to cook
temperature increases when an object absorbs IR radiation
how do electrical heaters work
long piece of wire heats up and emits lots of IR radiation
the emitted radiation is absorbed by objects in the room and the air in the room (energy is transferred by IR waves to thermal energy stored of the objects) so their temps increase
how does infrared radiation work on phones or laptops or TV remotes
IR radiation use to transfer information when distance is small and in line of sight of the emitter
what are optical fibres
thin glass or plastic fibres that carry data over long distances as pulses of IR radiation using total internal reflection
what is the danger of IR radiation
can cause skin burns
