P1 - topic 2 - infrared Flashcards
what is infrared radiation also known as?
heat radiation
What is infrared radiation given out by?
all hot objects
the hotter the object, the more/less infrared radiation is given out
more
heat loss through a houses uninsulated roof can be detected using what?
infrared sensors
How can infrared be detected by night vision equipment?
the equipment turns it into an electrical signal, which is displays on a screen as a picture
why do some infrared radiation appear brighter on screens when detected?
the object is hotter
optical fibre use infrared to do what?
transmit data
what is an example of optical fibres carrying data over long distances as pulse of infrared radiation?
telephone cables
how do optical fibres work?
by bouncing waves off the sides of a thin inner core of glass or plastic
the wave enters one end of the fibre and is reflected repeatedly until it emerges at the other end
what are 4 infrared uses around the home?
toasters
remotes
mobile phones/computers
security systems
How do security systems work using infrared?
bug ukase alarms and scurry lights use sensors that detect heat from an intruders body
What radiation can be used for cooking, transferring information, transmitting information and sensing heat?
infrared radiation
how do remote controls work?
they transfer information to TVs and DVD players using infrared radiation
what is the main use of infrared radiation?
monitoring temperature
