the electromagnetic spectrum Flashcards
(17 cards)
what are the 7 different electromagnetic waves in order?
- radio waves
- microwaves
- infra-red radiation
- visible light
- ultra-violet light
- x-rays
- gamma rays
what are radio waves used for?
communications
radio
tv
what are microwaves used for?
satellite communications
radar
cooking
mobile phones
what are infra-red radiation waves used for?
remote controls
detecting warm and cool skin
tracing infection
what are visible light waves used for?
fiber optics
endoscope (medical)
cameras
what’s the visible light colour spectrum?
red
orange
yellow
green
blue
indigo
violet
what are ultra-violet waves used for?
detecting forged bank notes
they produce fluorescence
what are x-rays used for?
looking for fractures in bone
angiograms
barium meals
what are gamma rays used for?
Radiotherapy
Sterilisation
pipe leakage detection
what are the dangers of microwaves?
they can cause internal heating of organs
what are the dangers of UV rays?
they can cause skin cancer
what are the dangers of IR waves?
can cause skin burns
what are the dangers of X-rays and gamma rays?
they can cause cancer of internal organs.
all these waves are…
transverse waves
how fast can these waves travel in a vacuum?
the speed of light (3.0 x 10^8 m/s)
what’s the wavelength of red light?
750nm
what’s the wavelength of violet light?
400nm
