Electromagnetic Radiation (ER) Flashcards
ER
Caused by accelerating charges.
Have a changing magnetic field.
Changing mag field induces a perpendicular changing electric field. Induces a changing magnet.
EM Energy?
Has energy associated with it so it transfers energy.
EM Medium
Does not need a medium to travel in and so can travel through a vacuum.
EM travels at?
Travels at the speed of light so c = 3x10^8m/s-1
EM spectrum
Range of frequencies of EM radiation.
Radio waves info?
(Red)
Longest λ
Lowest f
Lowest penetrating energy
Radio waves uses ?
Very high frequency . TV
Ultra high frequency .cell phones
Low penetrating ability due to lowest energy
Microwaves info
Long wavelength
Low frequency
Low energy
Microwave uses?
Microwave oven - cooked food
Satellites
Radar
Infrared from
Hot objects
Infrared info?
Long wavelength
Low frequency
Low energy cannot be detected by human eye but we can feel warmth
Infrared uses?
Remote controls
Night vision equipment
Infrared uses?
Remote controls
Night vision equipment
Visible light info?
Medium wavelength
Medium frequency
Medium energy
More penetrating than infrared
Ultraviolet rays from?
The sun
Ultraviolet rays info?
Short wavelength
High frequency
High energy
Produce vitamin C
Ultraviolet rays uses ?
Fluorescent lights give off UV
Ultraviolet rays info?
Short wavelength
High frequency
High energy
X rays info?
Short wavelength
High frequency
High energy
X ray uses ?
X ray imaging
Detecting cracks in metal
Gamma Rays
Nuclear reactions
Gamma rays info ?
Shortest wavelength
Highest frequency
Highest energy
Can penetrate human tissue
Gamma rays uses ?
Destroy cancerous cells
Sterilize surgical equipment
Particle nature
Energy is emmited in packets called quanta
