em spectrum Flashcards
full electromagnetic wave spectrum
gamma
x
ultra
light
infra
micro
radio
use of gamma
used in medicine for killing cancer cells
sterilisation
use of x rays
used to view inside of bodies and objects
use of ultraviolet waves
sterilising water
use of visible light
vision
Photography
illumination
use of infrared waves
electric grills
short range communications such as remote controllers for televisions
intruder alarms
thermal imaging
optical fibres
use microwaves
satellite television
mobile phones
microwave ovens
use of radio waves
radio and television transmissions
Define an analogue signal
define a digital signal
Sound waves entering a microphone make its voltage across vary. When this variation is continous it is known as an analogue signal
Digital signal - high and low voltages
2 ways sound can be transmitted
as a digital or analogue signal
benefits of digital signaling
including increased rate of transmission of data
increased range due to accurate signal regeneration
describe one use of optical fibre in medicine
Light travels down (optic) fibres into or out of body
To examine internal organ
Light travels both ways into and out of body
microwaves damage to the body
internal heating of body cells
infrared damge to body
skin burns
ultraviolet damage to the body
damage to surface cells and eyes leading to skin cancer and eye conditions
